CSS Pseudo Classes
CSS pseudo classes are special types of selectors that allow you to target an element based on its state. For example, you can use the :hover pseudo class to target an element when the user hovers over it, or the :active pseudo class to target an element when the user is clicking on it.
Pseudo classes are very useful for adding dynamic and interactive elements to your web pages. For example, you can use the :hover pseudo class to change the color of a button when the user hovers over it, or the :active pseudo class to make a button appear pressed when the user is clicking on it.