session - Why cookies dont expire after closing browser? -

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session - Why cookies dont expire after closing browser? -

in books , tutorials related web-programming written cookies expires when user close browser. cant understand why after closing browser(opera) can see list of cookies in "parameters" window. , how sites (for illustration facebook) identifier users after closing browser (session cookies must expire according books , tutorials)?

cookies of 2 different types:

session cookies, held in memory, , expire 1 time browser exits persistent cookies, have time-to-live, persisted on disk, , sent browser until time-to-live has elapsed.

read http://en.wikipedia.org/wiki/http_cookie

session cookies

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