callback functions

A callback function is a function passed into another function as an argument, intended to be executed after a certain task or event completes. Think of it like giving someone a note with instructions: once they finish their task, they read the note and perform the specified action. This allows programs to handle tasks asynchronously or in response to events, making code more flexible and efficient. Callbacks are common in situations like fetching data from the internet or waiting for user input, ensuring that certain actions happen only after specific tasks are done.