Probably most of us do not care how an air conditioner works, just as long as cool air flows through the room when we turn it on. If the expected cool air does not flow, we try to fix it ourselves, or at least fiddle with the dials and adjustments, and then call the repair technician to make a house call.
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You may wish to know a few air conditioning terms and be aware of the components that are involved. The basic bits are: compressor, condenser, expansion valve, and evaporator coil, along with assorted tubing and fans. There is a thermostat to control the conditions inside your own personal refrigerated box. These work together to remove heat from the space and bring cool comfort to the inhabitants. When they cease to work, it is time to call your local air-conditioning professional. They have the tools and technical knowledge to restore your AC
to full function.