In HTML, lists can be created using two main tags: <ul> (unordered list) and <ol> (ordered list).

Unordered List

<ul> creates a list with bullet points or other markers for each item without any specific order or ranking. Each item is enclosed in a <li> (list item) tag, which creates a separate bullet point for each item.

Ordered List

<ol>, on the other hand, is used to create a list with a specific order or ranking. The list items are numbered sequentially using the <li> tag.

You can also specify a start value for the numbering using the start attribute in the <ol> tag.

List Nesting

Both <ul> and <ol> can be nested inside each other to create sub-lists. For example, you can create a numbered list (<ol>) with nested bullet point lists (<ul>) for each item.