What is keyword?
Keywords are ideas and topics that define what your content is about. Those are the words and phrases that users enter into search engines, also called search queries.
Keywords on your web pages should be relevant to what people are searching for so they have a better chance of finding your content in the search results.
Keywords are important because they serve as a link between what people are searching for and the content you are providing to fill that need. You need to drive organic traffic to your site from the search engine result pages, and you can’t do that if your keywords are not relevant to your target audience.
To create content that ranks well organically and drives visitors to your site, you need to understand the language those visitors use and the type of content they seek. There are special tools you can use to do keyword research, for example, Google Keyword Planner, Moz Keyword Explorer, SEMRush, Ahrefs Keywords Explorer.