What does ‘Forex broker’ mean?

The Forex broker operates as an intermediary between you and the market. In other words, in order to find a buyer or seller for currencies, you can go to a broker and they match you up with either a prospective seller or prospective buyer.
However, instead of just being the intermediary between you and another buyer or seller, they are also the intermediary between you and what is called a “liquidity provider”.