A keyword in SEO is a word or phrase that users type into search engines. You should use keywords to help search engines understand your content. Keywords connect your website to what people are searching for. You must choose relevant keywords for your topic. You should include keywords in titles, descriptions, and content. Keywords help your website rank higher in search results. You can target short-tail or long-tail keywords depending on your audience. You should research keywords to find ones with high search volume and low competition. Keywords are crucial for driving organic traffic to your site.