O que é Swap dealer, commodity pool operator, introducing broker?

A swap dealer holds itself out as a dealer in swaps, makes a market in them, or regularly enters into swaps with counterparties for its own account in the ordinary course of business. A commodity pool operator operates a pool that combines funds from several persons to trade futures, options on futures or swaps, and solicits funds for it. An introducing broker solicits or accepts orders in futures, options on futures or swaps but does not accept money or other assets from customers to support them.