In HTML, heading tags are used to create section headings on a Web page. This can be useful in organizing the information on the page. There are six heading elements (H1, H2, H3, H4, H5, and H6), and the World Wide Web Consortium recommends using these elements in hierarchical order, from largest to smallest, beginning with H1. Traditionally, the H1 tag has been an important signal to search engines regarding the subject matter of the content on a page and was therefore considered a top ranking factor. Recently, some SEO professionals have called into question the importance of including an H1 tag on a page, but many maintain that an H1 tag containing important keywords can help boost the ranking of a Web page.