What are EDR, MDR and XDR? A handy guide

Cybersecurity discussions are full of acronyms like EDR, MDR, and XDR. These terms are often used together, and explanations often assume you already know what sets them apart.

But what if you don’t?

Well, that’s where this handy guide comes in. We’ll give you a simple breakdown of Endpoint Detection and Response (EDR), Managed Detection and Response (MDR), and Extended Detection and Response (XDR) to help you decide what you need and when you need it.

What is Endpoint Detection and Response (EDR)?

EDR software runs on your devices and continuously tracks activity. It’s specifically looking for suspicious behaviour, inbound and outbound. So, not just viruses, but more advanced threats, like ransomware, malware, and even insider attacks.

If something unusual happens, for example, a process attempting to encrypt files or connect to a known malicious domain, EDR generates an alert. It can also take automated action, such as isolating a device from your network.

What EDR typically includes:

• Continuous endpoint monitoring
• Behaviour-based threat detection
• Alerting and investigation tools
• Automated response actions

Where EDR works well:

• Businesses that want more visibility than traditional antivirus software provides
• Businesses with their own IT or security teams who can review and respond to alerts themselves.

Where EDR can fall short:

• Alerts still need to be triaged by someone
• It focuses only on endpoints, not email, cloud platforms, or network traffic
• It doesn’t automatically provide 24/7 monitoring

EDR gives you better visibility, but you still need people to make sense of what’s going on.

What is Managed Detection and Response (MDR)?

So, instead of your own team checking alerts 24/7, an outside security team handles it for you.

What MDR typically includes:

• 24/7 monitoring
• Threat hunting and analysis
• Incident investigation
• Guided or direct response actions
• Ongoing tuning of security tools

Who usually chooses MDR:

• Businesses without a dedicated security operations centre (SOC)
• IT teams that don’t have the capacity for round-the-clock monitoring
• Businesses facing increasing compliance, audit, or cyber insurance scrutiny

MDR is a great way to outsource your cybersecurity operations.

What is Extended Detection and Response (XDR)?

While EDR focuses only on endpoints, XDR covers a wider range of systems.

Instead of looking at events one by one, XDR connects activity across different systems. For example, it can link a strange login in Microsoft 365, odd device behaviour, and unusual network traffic into a single incident.

What XDR typically covers:

• Endpoints
• Email security
• Cloud applications
• Identity systems
• Network activity

The benefit of XDR:

• Broader visibility across your IT estate
• Correlated alerts rather than isolated ones

You still need your own experts or a managed service to monitor and respond to threats, but XDR provides a broader view of your security environment.

EDR vs MDR vs XDR: What’s the difference?

At a high level:

• EDR is a technology focused on endpoint threat detection and response
• MDR is a managed service that monitors and responds to threats using tools such as EDR and, in some cases, XDR
• XDR is a platform that integrates multiple security data sources beyond endpoints

These tools are related, but each one solves a different problem.

EDR answers: What’s happening on my devices?

MDR answers: Who is watching this, and who responds when something happens?

XDR answers: What’s happening across my entire environment?

Which approach is right for your business?

It really depends on your internal resources, risk profile, and infrastructure complexity.

Some common scenarios:

• A small business may benefit from EDR combined with MDR, ensuring tools are backed by 24/7 monitoring.
• A growing business with cloud, on-premise, and hybrid infrastructure might look to XDR, often delivered as part of an MDR service.
• A business with an established internal security team might implement EDR or XDR directly and manage it in-house.

The main thing to consider when you are making your decision is who will take action when an alert comes in.

Final Thoughts: EDR, MDR and XDR

Knowing the difference between EDR, MDR, and XDR helps you avoid two common mistakes: buying technology without the right people to run it, or outsourcing security without knowing exactly what you’re getting.

If you’d like to learn more about how to keep your business safe, check out our cybersecurity resources.

And contact us if you’d like to explore what MDR might look like for your business.

John Fisher

Managing Director, Westway IT

John is the founder of Westway IT and works directly with small businesses across Gloucestershire to keep their IT secure, productive and stress-free.

With a BSc in Computer Science and hands-on experience supporting businesses from 1 to 40 users, he specialises in cyber security, Microsoft 365 and business automation.

An award-winning MSP owner and active member of the global IT community (including GTIA), John focuses on solving real business problems, not just technical ones.

Published: 14 April 2026 | Last Updated: 14 April 2026