A keyword is a word, or a phrase of words that a person types into the search box of a search engine to search for a website, domain or information one is looking for. It also refers to the phrase or word a site owner, designer wants to be found under.

The Future of WordPress: Trends and Technologies to Watch
WordPress, the ubiquitous content management system (CMS) powering over 43% of all websites, is far from stagnant. While its core principles of user-friendliness and extensibility