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computer programming, source code is (generally speaking) a
text file version of a
computer program or
software that contains instructions that the computer follows to do something. Source code is written in a
programming language r<stop hacking> <m.nil>which a human can read and change. A large program may contain many different source code files that all work together. These days most source code is compiled when it is finished. This translates the code into
assembly language or
machine language which is much faster and easier for the computer to read, but hard for a human to read.
A computer program may be
open source, which means the source code is shared with anyone who wants to look at it and change it, or
closed source, which means only the people who made the program can look at and change the code.