If a Threat Landed on One of Your Devices Right Now, Would Anyone Actually Notice?
Traditional antivirus checks files against a list of known threats. That worked reasonably well for years, but modern attacks are designed specifically to avoid looking like anything on that list. Two terms come up constantly when businesses look at replacing basic antivirus: EDR and MDR. They sound similar, and the difference matters more than it first appears.
What EDR Actually Is
EDR stands for Endpoint Detection and Response. It is software installed on each device, laptop, server, or workstation, that continuously watches for suspicious behaviour rather than just scanning for known bad files. If something starts behaving like an attack, encrypting files rapidly, trying to disable security software, connecting to unusual locations, EDR can flag it and often isolate the device automatically before it spreads further.
The key word is “detection.” EDR gives you the tooling and the alert. Somebody still needs to be watching those alerts and acting on them.
What MDR Adds
MDR stands for Managed Detection and Response. It takes the same underlying EDR technology and adds a team of security analysts actually watching the alerts, day and night, and responding to genuine threats as they happen. Where EDR gives you the smoke detector, MDR gives you the smoke detector and someone monitoring it around the clock who calls the fire brigade the moment it goes off.
Why This Distinction Matters More Than It Sounds
A lot of businesses install EDR and consider the job done, without anyone actually assigned to review what it flags. An alert sitting unread in a dashboard at 2am does nothing to stop an attack in progress. The UK Government’s Cyber Security Breaches Survey 2025/2026 found that 43 percent of UK businesses identified a cyber breach or attack in the past year, and most small businesses simply do not have the staff to monitor security alerts around the clock, even with good tools in place.
Which Does Your Business Actually Need?
If you have dedicated IT or security staff with the time and expertise to monitor alerts continuously, EDR alone with strong internal processes can work. For the vast majority of small and medium businesses, that around-the-clock monitoring capacity does not exist internally, which is exactly the gap MDR is built to close. You get the detection technology and the trained eyes watching it, without hiring a security team of your own.
A Simple Way to Think About It
EDR answers “did something suspicious happen on this device?” MDR answers that question and adds “and someone is already dealing with it.” For most small businesses without an internal security operations function, the second answer is the one that actually stops an incident becoming a crisis.
How AOIT Networks Approaches It
Our approach to endpoint protection includes monitored detection and response, not just software sitting on a device hoping someone notices an alert, as part of the wider managed IT support we provide. Threats are watched for and acted on as part of your ongoing service, not left for you to interpret.
If you are not sure whether your current endpoint protection includes genuine monitoring or just software with nobody watching it, we are happy to talk it through.
Got Questions About Your IT?
Questions about your setup? Wondering if there's a better way to do things? We're always happy to have a no-pressure conversation about your IT needs.
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