The MCC is an education course that allows you to fly in a multi-member crew.
During the PPL(A), IR/SE, IR/ME, and CPL(A) schooling, you were the PIC, but on the airplanes that require multi-pilots crew the functions are divided into the PE (Pilot flying) and PM (Pilot monitoring). The MCC is a prerequisite for approaching to schooling for a particular type of aircraft in most airlines, but it also may be integrated with it.
At the Portorož Airport
* The practical part of education depends on weather conditions