It's an online community of people who hide treasures, known as caches, throughout their communities.
They may be hidden at the bottom of gorges, in cemeteries, or on a downtown street.
They are usually camoflaged and can be made out of ammo cans, empty pill bottles, or boxes.
Sometimes you will find small toys inside or just a piece of paper to sign your name to.
It's a treasure hunt that uses GPS coordinates to find the location of these caches.
Local geocachers say the family that was rescued from the cave on Tuesday was doing a cache that was difficult because of the terrain and locaction.
They say it's a family sport that requires people be prepared when on the hunt for a cache.
"Normally I bring somebody else with me unless it is flat ground where I don't have to worry about it," said Dave Kellar, a geocacher.
Kellar recommends to bring a group of people if you are inexperienced, to always carry a cell phone, and to let someone know where you are going.