Working with Pseudo-classes Many HTML elements have special states or uses associated with them that can be styled independently. One prime example of this is the link tag which has link (its normal state), a visited state (when the visitor has already been to the page represented by the link), hover (when the visitor has their mouse over the link), and active (when the visitor clicks the link). All four of these states can be styled separately. A pseudo-class is a predefined state or use of an element that can be styled independently of the default state of the element. Pseudo-classes are used to style not only the initial appearance of the anchor tag, but also how it appears after it has been visited, while the visitor hovers their mouse over it, and when visitors are clicking it. Dynamic Pseudo-classes can be applied to any element to define how it is styled when the user hovers over it, clicks it, or selects it. Structural Pseudo-classes are similar to the sibling combinatory selectors but allow you to specifically style elements based on an exact or computed numeric position. Other Pseudo-classes are available to style elements based on language or based on what tag they are not.