Unordered list tag <ul> introduces a list marked with bullet points. Like other types of list tags, it doesn't work by itself, but rather together with item tags <li>, nested within it. The unordered list tag <ul> works like a drawer here, while the item tags <li> are not dissimilar to the array of socks lying within it. Use unordered lists when the order of items is not important — the most common scenario is shopping lists.