A keyword may refer to a word or a sort of phrase that can be associated with a particular subject, document, or moment. It is used to explore or run specific searches in the title, in subject, in write-ups, in documents, and for internet searches.

In the context of a programming language, a keyword is a closely related or associated word that is reserved by a program because, the word has a special meaning that defines commands and specific parameters for that code set.

In SEO terminology for digital marketing, a keyword is used to describe a word or group of words that the Internet uses to perform search engine or search bar exploration.