A Geocacher is a person who engages in Geocaching.
Within the world of Geocaching, there are two basic groups that people fall into: geocachers and muggles. If one actively participates in geocaching, they would be considered a geocacher. Not all geocachers may have an account on Geocaching.com or on one of the alternate listing sites. Couples and families sometimes geocache under a single account. Some passively participate with others, but not on their own. They would still be considered a geocacher if they participate on some level.