Lists are used to specify a set of consecutive items or related information in well formed and semantic way, such as a list of ingredients or a list of procedural steps.
An unordered list is used to group a set of related items, in no particular order. This list is created with `<ul>` tag. Each list item is surrounded with `<li>` tag.
A description list is used to specify a list of terms and their descriptions. This list is created with `<dl>` tag. Each list item made up of a `<dt>` tag surrounding the term and a `<dd>` tag surrounding the description of the term.
You can also control the style of the list. You can use `list-style` property of lists. Your list can use bullets, squares, roman numerals or even images if you want.