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From Wikipedia: (Full article here)

Geocaching is an outdoor recreational activity, in which 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.

A typical cache is a small waterproof container containing a logbook and sometimes a pen or pencil. The geocacher enters the date they found it and signs it with their established code name, in order to prove that they found it. After signing the log, the cache must be placed back exactly where the person found it. Larger containers such as plastic storage containers (Tupperware or similar) or ammunition boxes can also contain items for trading, such as toys or trinkets, usually of more sentimental worth than financial.[2] Geocaching shares many aspects with benchmarking, trigpointing, orienteering, treasure-hunting, letterboxing, and waymarking.

Geocaches vary greatly in size and appearance. In the field you will see everything from to to a with a secret compartment. A general overview of the cache size graphic is found below. Please note that these are just examples; sizes can vary.
  - Less than 100ml. Examples: a or a tiny storage box typically containing only a logbook or a logsheet. A is a common sub-type of a micro cache that is less than 10ml and can only hold a small logsheet.
  - 100ml or larger, but less than 1L. Example: A sandwich-sized or similar.
  - 1L or larger, but less than 20L. Examples: a or ammo can about the size of a shoebox.
  - 20L or larger. Example: A large bucket.
  Other - See the cache description for information.