Beatmap description is a small area under a beatmap's page that gives players information about the beatmap using BBCode. It usually highlights some facts about the beatmap its creator deemed important enough, or is used to advertise other mapping projects.
Popular descriptions of ranked beatmaps often include the following:
Many beatmap descriptions contain at least one image (often an animated GIF of some sort) which is used to express and illustrate either the creator, song, and/or beatmap in a flashy way. They can also serve as a title or header to add flair and quality. To learn how to add an image, check out the BBCode article's section on images.
Beatmap descriptions usually list all guest difficulties (often alongside their respective icons) and their creators to credit the guest mappers.
The difficulty icons can be found in the Difficulty article.