Event-driven compute, not a server that waits — Lambda runs your code only when something invokes it, then disappears.
AWS Lambda is compute — not storage, not a database. Instead of a server that sits running and waiting for requests, you deploy a function: a bundle of code, dependencies, and configuration that AWS runs only when something invokes it. No invocation, no running process, no charge — the function simply doesn't exist as compute until it's called.