What is the essence of market relations and how do they differ from serf relations?

Market relations are based on the fact that the employee sells his labor in exchange for wages. In addition, here the employee is free to choose what kind of work to do. But in serfdom there was a compulsory obligation, and as such there was no payment for work, if at all. Moreover, the serfs were dependent on their master. In this connection, the quality of the work performed was much lower.