Characters makes it easy for writers, designers and developers to access special characters. They are easily found and copied to your clipboard, either as the character itself or the html code.
For example, if you need the copyright symbol, just type "copy" into the search bar and the app finds the character you're looking for. With one click you can copy it to your clipboard. The app knows which characters you use the most and those will always stay at the top, so you can access them easily.