A word that fills in as a key, with regards to the importance of another word, a sentence, section, or something like that. It is additionally called watchword.
A keyword, in the context of search engine optimization, is a particular word or phrase that describes the contents of a Web page. ... Keywords form part of a Web page's metadata and help search engines match a page to with an appropriate search query
Keywords are the search terms used to find your website in search engines. They are selected using Google keyword planner to rank websites higher in search results. They are implemented on the website meta tags and content to help increase the visibility of your domain in search engines.