Http is stateless, What does this mean?

Question

In one of the article two keywords "stateless" and "statefull" are used in the context of Diameter protocol.
Can someone please explain about stateless and statefull session with an example ?

Answer 1

HTTP is stateless:
1.HTTP is a connectionless and this is a direct result that HTTP is a stateless protocol.
2.The server and client are aware of each other only during a current request.
3. Afterwards, both of them forget about each other.
4.Due to this nature of the protocol, neither the client nor the browser can retain information between different request across the web pages.