CFDs are a leverage product and can involve a significant risk of loss. Trading CFDs may not be suitable for all, therefore you should ensure that you understand the risks involved and take into account your individual circumstances.
Trader's Glossary

What is Market Maker (MM)?

Market Makers are brokers that act as counterparties to the trades of their clients. Market Makers profit from setting the bid/ask spread, but they also profit from the losses that their clients incur. As counterparty they take the opposite side of their clients’ trades, i.e. buying when a client sells and selling when they buy, but Market Makers also manage their risk exposure by sometimes holding onto orders entirely and trading directly against their clients.