Geocaching is an outdoor recreational activity where participants use a Global Positioning System (GPS) receiver or mobile device and other navigational techniques to hide and seek containers, called geocaches or caches, at specific locations marked by coordinates all over the world. The activity can be considered a location-based game, and there are over 3 million active caches worldwide as of 2023. A typical cache is a small waterproof container containing a logbook and sometimes a pen or pencil. The geocacher signs the log with their established code name/username and dates it to prove that they found the cache. After signing the log, the cache must be placed back exactly where the person found it.

To begin geocaching, one can create an account online or through the Geocaching app to view a map of geocaches near them. They can then use the app to navigate to a geocache nearby and sign and date the logbook once they find it. The geocache must be placed back where it was found, and the experience can be logged online.

Geocaching can take participants to amazing and beautiful places or even just to a place in their town that theyve never been before. There are millions of geocaches worldwide, and there are probably some near anyone right now. The activity has been described as a global treasure hunt of people looking for caches or hidden stashes of objects.