Mathematica is an open source programming language created in 1988 by Stephen Wolfram.
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Wolfram Mathematica (usually termed Mathematica) is a modern technical computing system spanning most areas of technical computing — including neural networks, machine learning, image processing, geometry, data science, visualizations, and others. The system is used in many technical, scientific, engineering, mathematical, and computing fields. It was conceived by Stephen Wolfram and is developed by Wolfram Research of Champaign, Illinois. Read more on Wikipedia...
(* Hello World in Mathematica *) Hello := Print["Hello, World!"]
Test[1 + 2, 3, TestID -> "One plus two"]
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(* A comment *)