A program that reads another program and executes it

Explanation:

An interpreter reads a high-level program and executes it, meaning that it does what the program says. It processes the program a little at a time, alternately reading lines and performing computations. A compiler reads the program and translates it completely before the program starts running.

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i believe the two important functions that skype uses are nat traversal and user location.good luck        

explanation:

1. the seasons of the world