Tabular Example

DL
Definition List
UL
An unordered list
OL
An ordered list

Long Example

Definition List
Definition List is the HTML list type that gets no respect. Many web developers don't even know it exists.
Unordered List
An unordered list typically has bullet characters denoting each item and is sometimes also called an un-numbered list.
Ordered List
An ordered list typically has arabic numberals denoting each item and is sometimes also called a numbered list.