F#

This general-purpose, cross-platform language was created by Microsoft with efficiency as its main goal. After reaching open-source status, F# gained certain popularity and you can now use it for enterprise programming, data science, machine learning, cloud computing, math and stats, and other related fields. 

A programming language is a formal language comprising a set of strings that produce various kinds of machine code output. Programming languages are one kind of computer language, and are used in computer programming to implement algorithms.