Let’s say you’re a kid playing outside waiting for your mom to make dinner. An API call would be popping your head in to ask whether dinner is ready. A webhook would be waiting until your mom calls your name to know that dinner is ready.
An API call is about proactively getting information while a webhook is about reactively being notified that something has changed.
There are more specifics but I wanted to provide a ELI5 beyond the other answers already given
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