What is the service Web Threat Defense in Windows 11?

I have a “server” that runs Windows 11 Pro. It is more or less headless (I normally use Remote Desktop and ssh to manage it). It is a little CPU starved. I see that there is a Web Threat Defense service that consumes like 1.0/1.5% CPU. I know it is from Microsoft. What I want to know is what is the protection that it gives and or exactly what it does, to decide if it acceptable to disable it. If I google for “web threat defense” I get like 3 pages of results, and nothing useful.