Introduction the merge sort algorithm. Tell me some history, or how it works or what it is best at$.$

The steps of the merge sort algorithm.

What is this merge sort algorithm best at$?$

What are some unique attributes about this algorithm?

Did this result in another algorithm?

Who or what uses this algorithm?

Source, link to your source

For example, "Google: 'library sort algorithm'" then locate the resources, write a report covering the above, and list the URLs used.