The human brain is an overloaded machine. It tends to forget events or things or plans very easily. It requires continuous effort to make the brain remember things. Since a major part of the brain is dedicated to the visual sense, the most widespread usage to keep the brain on its toes is providing visual hints. Visual hints act in the same way as regular bookmarks would do in a PhpStorm cookbook they let you remember what section you were reading and when.
PhpStorm provides you with a feature wherein you can create visually appealing labels, that is, tags.
Tags are visual labels that let you and your team know which revision was special for you. Thus, you can create visually appealing labels or tags to denote special events, such as Release Version 2.3
or Bug fixes for V2.2
, and so on. So, where is the hint then? The hint is the name. Why visual? Because you can remember names and visuals easily.