It's really complicated and I don't want to go into too much detail, but no, a market maker isn't "connecting" limit orders. A market maker is a market particip

It's really complicated and I don't want to go into too much detail, but no, a market maker isn't "connecting" limit orders. A market maker is a market participant, just like me or you (well, sort of). They buy things and sell things, they don't have magical powers. People get confused, but most hft firms utilize market making strategies. A market maker is just someone who puts limit orders on the book (making) vs taking liquidity off of the book (takeout). Anyone can be a market maker, and many firms do both market making and taking.