The Premier Development League (commonly known as the PDL) is a development league sponsored by United Soccer Leagues in the United States and Canada, forming part of the United States soccer league system. It is currently considered the top-level men's amateur soccer competition in the United States, although it has no official designation as such from US Soccer. The league has 65 teams competing in four conferences, split into ten regional divisions. Unofficially, it is considered to be the fourth tier of competition, behind Major League Soccer, the North American Soccer League and the United Soccer League, along with the National Premier Soccer League which is also considered to be in the fourth tier of competition in the United States. With USL Pro re-branding as the United Soccer League in February 2015, the PDL dropped the "USL" descriptor from their name, simply operating as the "Premier Development League".