Jason Brimhall explains what SQL Server endpoints are:
You may have heard the term endpoints thrown around in technical discussion and wondered “what the heck is an endpoint?” Well, that is a good question. An endpoint in the simplest form is a connection or point of entry into SQL server.
Another way of thinking about an endpoint is to look at the ends of a line. Generally speaking, there is a stop point at each end of the line. At this stopping point, the line may connect to something else and therefore be a point of entry into that “something else”.
Read on for more information, as well as a script to show who owns each endpoint.