What is the main purpose of using keyword in SEO?

The main purpose of inserting targeted keywords is to make your website visible on the search engine. It helps to visible your website if the users inserted related to your keywords term.

keywords is used to increase the results according to the user's point of view.

Keywords or key phrases are used by the search engines to populate the subjects over the internet. Search engine stores keywords in the database and when search is done, it will comes up with the best possible matches.

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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.

Main purpose of using keywords to optimize the full site with a simple word  that word referred as Keyword.Because it is quite difficult to remember all sites which are provide that facility.

The keyword will tell about your whole website within some character(keyword). Keywords will help you to find your website when someone search in search engine using related keywords.

As My Opinion Keyword is a particular terms used for search through search engines.