callback function is a function that:

  • is passed to another function as an argument and only called in its code.
  • contains a reference to itself in its code.
  • is always executed at fixed intervals.
  • is always called with a certain pre-defined delay.
Explanation & Hint:

A callback function is a function that is passed as an argument to another function and is invoked or called by that function at a specific point in its execution. The primary purpose of a callback function is to provide a mechanism for executing code asynchronously or to allow behavior customization of a function.

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