If you are trying to improve your cyber security, endpoint security is one of the first places you should look.
That is because most attacks still start where your people work: laptops, desktops, mobiles, servers, and the accounts connected to them. In the UK, 43% of businesses identified a cyber breach or attack in the last 12 months, and phishing remained the most common attack type among affected organisations.
The challenge is that endpoint security terminology can get confusing very quickly. You hear about antivirus, EDR, and XDR, and before long it starts to sound like you need to buy 3 different products just to keep a laptop safe.
In reality, these tools do different jobs. Some overlap, some build on each other, and some make far more sense for certain businesses than others.
If you want the simple version, it is this: antivirus helps block known threats, EDR helps you detect and respond to suspicious activity on devices, and XDR goes wider by linking endpoint signals with other parts of your environment such as identity, email, and cloud apps.
Microsoft describes Defender for Endpoint as an enterprise endpoint security platform designed to prevent, detect, investigate, and respond to advanced threats on endpoints, while Microsoft Defender XDR is described as a unified defence suite that coordinates detection, prevention, investigation, and response across endpoints, identities, email, and applications.
The NCSC describes antivirus as software that attempts to detect, quarantine, and block malware from running on devices.
So how do you choose?
The answer usually comes down to your risk, your size, your internal capability, and how much visibility you really need.
What endpoint security actually means
Endpoint security is the protection of the devices your business relies on every day.
That includes things like employee laptops, office desktops, mobile devices, virtual machines, servers, and sometimes even network-connected devices. If it stores data, accesses company systems, or gives a user a route into your wider environment, it matters.
That is why endpoint security is not just about installing software and moving on. It is tied to your wider security services, your user access controls, your Microsoft 365 setup, your patching standards, and how your IT team responds when something odd happens.
A lot of businesses still think endpoint protection means “we have antivirus installed, so we are covered”. That is understandable, but it is no longer enough on its own for most organisations.
What antivirus does well
Antivirus is the most familiar endpoint security tool, and it still has a place.
At its core, antivirus is designed to detect and stop malicious software. The NCSC says antivirus products attempt to detect, quarantine, and block malware from running on devices, working alongside network defences and device configuration.
That means antivirus is still useful for:
- Blocking known malware
- Scanning files and downloads
- Catching common threats early
- Adding a basic layer of device protection
- Helping smaller environments reduce obvious risk
If you are a very small business with a simple setup, antivirus may be part of a sensible starting point. It is certainly better than having nothing.
But antivirus mainly looks for malicious files, known signatures, and recognised bad behaviour at a relatively basic level. Modern attacks do not always arrive as obvious malware. Some use legitimate admin tools, stolen credentials, malicious scripts, or hands-on activity that can slip past traditional antivirus if you are relying on it alone.
That is where the conversation usually shifts towards EDR.
What EDR is and why businesses moved towards it
EDR stands for Endpoint Detection and Response.
This is the layer that goes beyond simply blocking known bad files. EDR is designed to monitor endpoint activity, spot suspicious behaviour, surface alerts, and support investigation and response when something looks wrong. Microsoft says EDR capabilities provide near real-time and actionable detections so analysts can prioritize alerts, understand the scope of a breach, and take remediation actions.
In practical terms, EDR helps you answer questions like:
- Has a device started running suspicious PowerShell commands?
- Has a user account launched unusual processes?
- Is ransomware-like behaviour appearing on a machine?
- Has a compromised device started talking to malicious infrastructure?
- Which other devices or users might be affected?
That is a big step up from basic antivirus.
It is also why EDR has become so important for businesses with hybrid working, cloud systems, and growing compliance pressures. Devices are no longer sitting neatly behind one office firewall all day. Your users are at home, on trains, in hotels, and in client offices. Your endpoint controls need to follow them.
That fits naturally with a broader IT support and management approach, because EDR is not just a product. It is part of an operational security model.
Where antivirus still fits
It is easy to talk about antivirus as if it is old news, but that would be a mistake.
Antivirus still matters. In fact, the NCSC still recommends antivirus as part of malware protection for smaller organisations, alongside patching, app controls, and sensible device management.
The better way to think about it is this:
Antivirus is the foundation.
EDR is the extra visibility and response layer.
That is also why you will often see modern security stacks where antivirus still exists, but it is not the whole story. Microsoft, for example, supports scenarios where antivirus and EDR capabilities work together rather than as an either/or choice.
So the question is not really “antivirus or EDR?”
For most businesses, it is “is antivirus alone enough for the risks we face?”
Often, the answer is no.
What XDR adds on top
XDR stands for Extended Detection and Response.
This is where things widen out beyond the endpoint itself. Rather than only watching laptops, desktops, and servers, XDR correlates signals across multiple areas of your environment. Microsoft describes Defender XDR as unifying protection across endpoints, identities, email, and applications.
That matters because a real attack rarely stays in one place.
An attacker might start with a phishing email, steal a user’s credentials, sign into Microsoft 365, move through endpoints, and then try to access data or send more malicious emails internally. If you are only looking at the endpoint, you may miss the wider pattern.
XDR is designed to link those events together.
So instead of seeing:
- 1 suspicious email alert
- 1 strange sign-in
- 1 endpoint alert
- 1 cloud app anomaly
…you see them pulled into a more complete incident view.
That gives your team a better chance of understanding what is really happening and responding faster.
EDR vs XDR in plain English
A simple way to think about it is this:
Antivirus tries to stop malware.
EDR watches what is happening on the device and helps you investigate and respond.
XDR joins the dots between the device and the rest of your environment.
That does not mean XDR replaces good endpoint protection. It usually depends on it. XDR becomes powerful when the signals feeding into it are strong, well-configured, and monitored properly.
This is why choosing between EDR and XDR is not always a straight product comparison. Sometimes XDR is the right direction, but only if your wider environment is mature enough to benefit from it.
How to choose the right option for your business
This is the bit that matters most.
You do not choose endpoint security by chasing the newest acronym. You choose it based on what your business actually needs.
Choose antivirus if your environment is very simple
If you are a very small business with a limited number of devices, no in-house IT security capability, low complexity, and tight budgets, a solid antivirus setup may be an acceptable part of your starting point.
But it should not exist in isolation.
You would still want:
- Strong patching
- MFA
- Secure Microsoft 365 configuration
- Staff awareness training
- Backups
- Sensible permissions
- Clear support arrangements
That is where linked services like Cloud Services / Office 365, hardware and software, and day-to-day support start to matter just as much as the endpoint tool itself.
Choose EDR if you need stronger visibility and response
For many SMEs and mid-sized businesses, EDR is the practical sweet spot.
It gives you more confidence that suspicious activity on a device will not go unnoticed. It also gives your IT partner or internal team better evidence when something needs investigation.
EDR is a strong fit if:
- You have hybrid or remote users
- Your staff use Microsoft 365 heavily
- You handle sensitive business or customer data
- You want faster detection of suspicious behaviour
- You need more than basic malware blocking
- You want to reduce dwell time if something slips through
This is one reason endpoint tooling often sits inside a wider consulting conversation. Good security choices depend on how your people work, not just what product brochure looks best.
Choose XDR if your attack surface is broader
XDR becomes more attractive when your business has grown in complexity.
That might mean:
- Multiple offices
- International teams
- Cloud-heavy operations
- Bigger Microsoft environments
- More compliance obligations
- More sophisticated threat exposure
- A need to correlate identity, email, endpoint, and app activity
If you are managing users across regions, cloud apps, remote devices, and multiple business systems, XDR can help pull all those signals into a more joined-up view. That can be especially useful when you are dealing with broad environments supported by global support and international projects or European IT support.
But there is an important reality check here.
XDR is not automatically the best choice just because it is broader. If nobody is reviewing alerts properly, responding to incidents, tuning policies, or acting on the data, you may end up paying for extra visibility without getting the full value from it.
The mistakes businesses make when choosing
There are a few common mistakes that come up again and again.
1. Treating endpoint security as a standalone purchase
Endpoint protection is not a box-ticking exercise.
It only works properly when it connects to your wider support, configuration, identity controls, patching, and incident response process. That is why migrations and broader platform changes often need security thinking built in from the start, not bolted on afterwards.
2. Buying for the worst case without the team to manage it
There is nothing wrong with aiming high, but sophistication only helps if it is usable.
A well-managed EDR rollout may protect you better than a poorly implemented XDR setup that floods the team with noise.
3. Assuming antivirus is enough forever
It may be enough for some very small, low-complexity organisations as part of a wider baseline, but many businesses have already outgrown that level of protection without realising it.
4. Ignoring testing
You do not really know how your defenses perform until they are tested.
That is why services like penetration testing and articles like Network Penetration Testing: What It Is, What It Isn’t, and Why It Matters are relevant here. Security is not just about buying controls. It is about validating them.
5. Forgetting the human side
Most attacks still involve users at some stage, whether that is clicking a phishing link, reusing a password, approving an MFA request, or trusting the wrong email. The UK Government’s Cyber Security Breaches Survey 2025 found phishing was by far the most common form of cyber crime among affected businesses.
That is why endpoint security has to sit alongside identity protection, email security, and clear user guidance.
So which should you choose?
If you want the practical answer:
- Antivirus is a baseline, not a full modern strategy for most businesses.
- EDR is often the right next step for organisations that need stronger visibility on devices.
- XDR is the better fit when you need to connect endpoint activity with identity, email, cloud, and application signals across a broader estate.
For many businesses, the best choice is not “the biggest” option. It is the option you can deploy properly, manage consistently, and align with the way your business really works.
That is very much in line with Northern Star’s approach across Why Us, the wider news section, and the hands-on model delivered by the team. The goal is not to drown you in jargon. It is to build the right level of protection around your users, devices, and business priorities.
Final thoughts
Endpoint security matters because your devices are where attackers meet your business.
Antivirus still has value. EDR adds the monitoring and response that many businesses now need. XDR gives you a wider, more connected view when your environment is more complex.
The right answer depends on your setup, your risks, and how much operational support sits behind the technology.
If you are not sure whether your current protection is basic, good, or genuinely fit for where your business is now, that uncertainty is usually the sign that it is time for a proper review.
If you want help choosing between antivirus, EDR, and XDR, or you want to understand how endpoint security fits into your wider Microsoft 365, device, and cyber security setup, speak to Northern Star through their contact page. A straightforward conversation now could save you a far more expensive one later.
