• Lambdas are deceptively close to mental model we have of normal servers
• They both wait for some event (a request) and handle it when it happens
• Servers run continuously. Lambdas don't
• AWS will create and shut down Lambdas when it wants. Lambdas can't be too stateful
• Even with scaling, servers may live for hours or days
• Lambdas may live for minutes (or less)

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