Why do people save session data in hashed form?

[corythestick]

I'm writing a project where after registration I save \[code\]id\[/code\] of each client in \[code\]session\[/code\].As I know, \[code\]session\[/code\] stores data on server side, so it seems to be secured. But I've seen many times when session variables stored in hashed form. So, why do they do it?Thanks much