A heading is a title or label that introduces a section of text, helping readers understand the main topic or idea. It is typically larger or bolder than the surrounding text, making it stand out. Headings are commonly used in documents, articles, and books to organize content and guide readers through the material. In digital formats, such as websites and blogs, headings are often formatted using HTML tags like H1, H2, and H3. These tags not only improve readability but also enhance search engine optimization (SEO) by signaling the importance of content to search engines like Google.