The Uniform Domain Name Dispute Resolution Policy (UDRP) is the procedure incorporated into your domain registration contract (in most major TLD's).
The World Intellectual Property Organization (WIPO) is one of the two main providers of UDRP dispute services. The other major provider is the National Arbitration Forum (NAF). There is also one in Hong Kong and Beijing - the ADNDRC - and one in New York, whose name I can never remember, but which has some truly stellar fees.