If content is king then the keyword is queen in search engine optimization.
Keyword is the phrase or a search query typed by the user in Google. When a user searches something by entering the search query in Google. It gives the result with top 10 website links.
Google consider 200 factors before giving search results. Keyword is the base of Google search. Search engine optimization starts with keywords. You need to choose the right keywords for ON page and OFF page optimization.
Keyword is the most critical element in SEO.