Short answer.
The Process Info is indicating all the connections to that sql server.
When a connection is establised it is given a Spid. When a connection is closed the Spid is droped for reuse.
If the connecting app/user does not close their connection you can run out of connections.
Having alot of connections open for a long period of time indicates a problem with the calling application/Users.
You can clean up unwanted connections using the kill command