Comment
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A line written within a set of instructions that is not to be interpreted by the compiler or the interpreter. An aside. Mostly used to instruct a human reader about what is happening or to otherwise give guidance within the set of instructions.
In many UNIX configuration files comments are preceded with the "#" symbol. Though some applications with roots in "C" will use the semicolon ";" for comments (named.conf for instance)
Each programming language has its own set of comment characters and rules about how to use them.