Mexico's men's football has four tiers of clubs in the following order of level of competition: Liga MX, Liga de Expansión MX, Segunda División de México, and Liga TDP. Promotion and relegation are used by the Mexican Football Federation (FMF) to advance (promote) a lesser tier club into competition of like quality their aggregate percentage score warrants play in a higher competition tier. They replace the club that is demoted (relegated) to the next lower tier level based on their aggregate. Promotion and relation take place after the Clausura season has ended.