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In computing, a keyword is a word with a special, predefined meaning within a programming language or a search context. In programming, keywords are reserved words like if or int that define a language's syntax and structure, and cannot be used as variable names. In the context of web searches, a keyword is a word or phrase typed into a search engine to find information, like "computer keyword definition".

In programming

Definition: A reserved word that is part of a programming language's syntax and has a specific, fixed meaning.

Function: Keywords control the flow and behavior of a program, define the types of data, and structure the code.

Restrictions: Keywords cannot be used as identifiers (e.g., variable names, function names, or class names) because the compiler or interpreter already has a specific meaning for them.

In search

Definition: A word or phrase that a user types into a search engine to find relevant information.

Function: Keywords are used by search engines to match queries with the content on web pages.

Context: In search engine optimization (SEO), keywords are the words a website owner wants their content to rank for in search results.