a Session is a semi-permanent interactive information interchange, it is
usually created upon the entry or login on the website, and destroyed
levaing or logout,
in rails by convention you may save the session id on the database, but
basically once someone enters the website it has a session and in the
session you can store values like session[:xkcd] = “funny cartoon” in
page, and after a few actions and interactions over the website , you
acess it for example like, a=session[:xkcd].
a Session normally is statefull and is unique for each user and its
serves as a unique identifier that is sent from a
client http://en.wikipedia.org/wiki/Client_(computing) to identify
current interaction session.
erg… hope it’s usefull information.