Nowadays most common radio receivers are with 6 and 8 channels but you can find versatile 2.4Gh radio systems with up to 16 channels.
According to the adopted modulation, radio receivers can be categorized in:
PWM RX (Pulse Width Modulation);
PPM receivers (Pulse Position Modulation);
CPPM receivers (Combined PPM);
SBUS receivers (Serial Bus aka S.BUS);
DSM2/DSMX receivers (Digital System Multiplexer).
Radio receivers for drones and quadcopters
Just few of the best radio receiver brands: FrSky, Futaba/Spektrum, iRangeX, RadioLink, FlySky and Walkera.
Which type of receiver should you use?
Tough question, When it comes to choosing one I would personally suggest FrSky radio system for multi-rotors but I also like the much cheaper FlySky radio.
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Enjoy safely piloting radio controlled UAVs!