What is the difference between Server side events SSE and Web hook?
The difference is:
1) using SSE you pull updates to your Front-End.
2) using Web-hook you pull updates to your Back-End.
The first is simplier, easier to implement and manage. The second is more secure/reliable.
Also, some server may implement long-polling, which will delay response until new data arrives, so it might be used instead of SSE.