To put it simply, it is a set of rules (a syntax) that programmers use to write computer applications. It is an artificial language (code) that is written in an editor, read through a compiler, and then interpreted by the computer, which executes the program (or "commands," as techies say).
There are many programming languages; see the section entitled "Programming, Technologies & Standards" in the Index of the book "NetLingo The Internet Dictionary."
NetLingo Classification: Technical Terms
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