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Keyword – A word or phrase indicative of the major theme in a piece of content. When you search for something in a search engine, you type in a keyword and the search engine gives you results based on that keyword. One major Goal of SEO is to have your website show in searches for as many keywords as possible.

Keyword Phrase – A group of two or more words that are used to find information in a search engine. Sometimes, when searching for something, one single keyword does not provide the information you seek, where a keyword phrase allows you to string multiple words together to find better information.

Keyword Density – Keyword density refers to the percentage of how often a keyword appears on a webpage in relation to the total words on that webpage.

Keyword Stuffing – When a web page uses a keyword too often or superfluously, with the intent of manipulating search engines. This type of behavior is frowned upon and can lead to either algorithmic devaluation in search, or a manual penalty from Google.