How are my orders matched?

This may seem like a very basic question, but i'm not entirely sure of the process that takes place when i submit an order with my broker.

If I place a market order, is the broker taking the other side of my order? (Im guessing not, if they are a broker right?) or is it getting matched electronically with existing orders at next available price?

Take a look at this sticky thread, by Darkstar.... good info about how brokers works and market structure there...



Cheers!