List Tags:

The most common HTML lists are ordered and unordered lists:

Unordered List :

An unordered list starts with the <ul> tag. Each list item starts with the <li> tag.

Syntax 
    <ul>
        <li></li>
    </ul>

value for 'type' attribute:-

* disc (default)
* circle
* square

Ordered List :

Syntax 
    <ol>
        <li></li>
    </ol>

An ordered list starts with the <ol> tag. Each list item starts with the <li> tag.

value for 'type' attribute:-

* 1 (Numbers)
* a (lowercase alphabates)
* A (uppercase alphabates)
* I (uppercase roman)
* i (lowercase roman)

Apart from the above there is another type of list called "Definition List".Definition lists create a list with two parts to each entry: the title to be defined and its description. This creates lists similar to a dictionary or glossary. A Definition List is a list of items having description for each item.There are three tags associated with the definition list:

<dl> - This is to define the list
<dt> - This is to define the definition title
<dd> - This is to define the description of the title

Definition List :

Here is an Example of a Definition list :

Syntax 
<dl>
  <dt></dt> 
  <dd> </dd> 
</dl>
Example: List.php