Is an individual that has negotiated and consented to be on the receiving end of a specific BDSM activity or scene. However, this individual will not yield control or authority to another person.
For the most part, there is no form of power exchange with a Bottom, only the exchange of sensations or service.
For example a bottom will negotiate to be on the receiving end of a spanking or to be tied up for a bondage scene. They will enjoy the sensations of these experiences from the receiving end.
While all submissives will bottom, not all bottoms will submit.