Kata is a formal, pre-arranged series of techniques performed by two partners. The purpose of kata is to demonstrate how to use the theories of judo in each throw. The word kata means “form.”
Kata looks something like a dance. Like a Japanese tea ceremony, there is a specific routine and standard that both partners work together to achieve. One partner (Tori) demonstrates each technique on the other partner (Uke). Partners work together closely, and sometimes remain partners for years.
Kata is the only part of judo that ever involves weapons. Some tournaments include a kata competition. There are levels of kata, and the first kata, Nage-no-Kata, is a requirement for earning a black belt.