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In computer science, a keyword is an identifier which has been reserved for core language usage. Some common keywords are: else, end, goto, if, print, return, switch, then, while, etc. There are usually restrictions about reusing keywords as names for user-defined objects such as variables or procedures. Languages vary as to what is provided as a keyword and what is a library routine, for example some languages provide keywords for input/output operations whereas in others these are library routines.
A keyword is a featured word of a technical article. Some publications specify a fixed set of keywords from which those for a particular article should be chosen.
Keywords are a feature of the ISP America Online; which allow one to bypass URLs.