How passwords and logins work: why a website should not know your password
Session cookies: how a website remembers that you are logged in
You log in once. Then you click around the website for an hour, and it never asks who you are again. Yet every click reaches the website as a brand-new message.
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You logged in once. Then you tap Tuesday, 6 pm and Book. Each tap sends the website a new message, a request, and the website answers each one on its own, with no memory of the one before.
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Asking for your password at every tap would drive anyone away. Yet the website must know that this Book comes from you.
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