Using Lists to Group Information
Lists are among the essential tags for laying out information on a Web page. List tags include unordered (bulleted) lists (<ul>), ordered (numbered) lists (<ol>), and definition lists (<dl>), each of which adds semantic value to the information it contains. You can use lists when you need to display directions or procedures on a page, or even as the basis of a navigation structure. Lists also work well with advanced styling using cascading style sheets.
The following table provides a bit more information on the three basic types of lists.
Numbered items such as procedures
Bulleted items that relate to each other but without any specific order