It means if somebody wants to buy a good domain and this owns by someone so taking from the owner and selling to desired person at a very affordable price is knows as domain broker.
This responsibility of a broker is to maintain a agreement to seller to sell their domain in good prices some time less or sometime more. The aim to sell the domain is for average profit not to find some miracle buyer with good and deep pocket. So this is very important how and where are you searching the domain broker.
Find a domain broker is as same as you are finding someone who can help you in busying the property in affordable rate and in return only need a small percentage of the full amount. Same is being performed and offered by softonic solution who first find out individuals need and then offer them their service accordingly.