What is the difference between cookies and session? and Where we will use sessions in real time project?

Both cookies ans session are used to hold a value..but both are 
different because cookies are used to persist the information at
client side whereas session is used to persist the information at server side.

cookies is used to stored client information in client side and session
is used to provide uniqueness to client request.in real time session variable
is use to move data from one page to other page.and session is use for server side 
state  management