What are sessions and cookies in php and where are they stored?

Question

What are sessions and cookies in php and where are they stored?

I searched but I can\'t find the exact answer.

Answer 1

A cookie is some piece of data the server requests the client to store and send in consequent requests.

A session is some data stored on the server, and connected to the user via a session id. This session id is most of the time stored in a cookie.

A session can be stored on the filesystem, most likely in a temp directory, but also in a database.

Both cookies and sessions have a expiration date connected to them, so they wont last forever.