Prominent text on a web page, such as a heading, is often used by search engines to determine where to rank that page. They are given their own tag to the main body of page text. One helpful tip for improving your chances for moving up in the search engine rankings is to improve your H1 tags. The H1 tag is still important to search engines today, even though it has been around for a long time and many changes have evolved over the years as to how search engines work.
The H1 tag is to the search engines, like a headline is when you look at a newspaper. We trust that it’s relevant to the content in the article, and so we’re drawn in if the headline is about something we’re interested in. If the content isn’t good, and if it doesn’t have a good headline telling the search engines why it’s there, then the search engines will not rank it highly.
Therefore, if you are trying to optimize a given web page for one keyword phrase, it should appear in the H1 header. You can see an example of the html in the screen shot from the site http://www.htmlcodetutorial.com/_H35n.html. The H1 tag (and the other H tags as well) tells the search engine that those are important, relevant words for that page. In other words, it is what the search robots “see” as a headline so that they will “know” what a given page is about, which can only improve your search engine ranking.