Compressor, evaporator or A-coil, blower, they are all part of your central air conditioning system
A central air conditioning system actually works by removing the heat from the air in your house, not by manufacturing additional cold air and introducing it to your home. In order to make this removing of heat take place, you require three main components: 1) a compressor which usually sits on a concrete slab outside of your home, 2) an evaporator coil (sometimes called an A-coil because it is in the shape of the letter A) which sits atop your furnace inside your home and 3) a blower to both pull in the warm air and re-circulate the now cooler air through your home. This blower is usually found inside of your furnace, so parts of your furnace in effect help to cool your home.
Here is how all of these components work together to cool your home. First, the compressor outside compresses the refrigerant gas in the system and turns it into a liquid. This liquid gets pumped into the evaporator coil inside your home. The blower (for all intents and purposes, your furnace) then pulls the warm air from your home into the system and pushes it over the coil.  As this warm air passes over the coil the heat from it gets absorbed by the refrigerant liquid causing it to boil and change state back into a gas.  This gas then gets pumped back outside to the compressor where it is compressed once again into a liquid.  This second change of state, from gas to liquid, releases to the outside environment all of the heat that the liquid absorbed from inside of your home.