There are two kinds of Improv, improv sports and competition improv.
Improv sports is a collection of games where actors can compete, or just have fun.
There are several types of sport organizations who have created most of the sports. Two of these are TheatreSports and Comedy Sportz Royalties must be paid to these organizations before any theatre group has a public performance of the improv games. Competition Improv on the other hand, is more restrictive as far as acting goes. Scores are given in each round and may be used to determine a winner. The object of this is based on having a beginning, middle, and end.