An ordered list typically is a numbered list of items. HTML 3.0 gives you the ability to control the sequence number – to continue where the previous list left off, or to start at a particular number.
There are three different types of list in HTML and each one has a specific purpose and meaning. Unordered list — Used to create a list of related items, in no particular order. Ordered list — Used to create a list of related items, in a specific order.