The document discusses the four main types of competition: perfect competition, monopolistic competition, oligopoly competition, and monopoly competition. Perfect competition is characterized by many small businesses, homogenous products, free entry and exit into the market, and perfect information. Monopolistic competition has many businesses but differentiated products, while oligopoly has a small number of interdependent competitors. Monopoly exists when there is only one provider of a product or service without close substitutes. Examples of each type are given.