Dog agility is a super fun and addicting activity where a person and a dog work through a course of obstacles such as jumps, ramps, tunnels, etc.  The human guides and communicates with the dog to navigate the obstacles in a safe way.  Once the dog and handler team have practiced, you can enter into agility competitions where you complete in progressively harder courses which challenge the ability of the dog/handler team.  In a competition there are several different types of courses or games which all have different rules and instructions on how to play according to the organization you enter with (AAC, NADAC, UKI, CKC, etc.)  In agility there is always more to learn, practice and improve!