This document defines HTML tags and provides brief descriptions of each tag's purpose. There are over 80 tags described, including common text-level tags like <p> and <strong> for paragraphs and emphasized text. It also covers several groups of tags for defining structured documents like lists (<ul>, <ol>, <li>), tables (<table>, <tr>, <td>, <th>), and forms (<form>, <input>, <select>, <option>). Several tags are noted as not supported in HTML5, with alternatives suggested like using <abbr> instead of the deprecated <acronym> tag.