Callback Functions

Callback functions are everywhere in JavaScript.
There are two types of callback and they have important differences
Synchronous -
Asynchronous -

A function that accepts another function as an argument is called a higher order function.
The callback function is passed as an argument to the higher order function which then invokes the callback function to perform the operation.
A callback function can be created as a regular named function or anonymously using an arrow function.
If you have defined a function which you are supplying as an argument to another function then you are creating a callback function.

map(array, callback) is an example of a higher order function

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