RF Modules are used wireless transfer data. This makes them most suitable for remote control applications, as in where you need to control some machines or robots without getting in touch with them (may be due to various reasons like safety, etc). Now depending upon the type of application, the RF module is chosen. For short range wireless control applications, an ASK RF Transmitter-Receiver Module of frequency 315 MHz or 433 MHz is most suitable.
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Get all the technical details about this module in its datasheet. You can download the datasheet from here.
GETTING STARTED VIDEO
This video shows, how you can interface this RF module using your Arduino UNO board
This video shows how to use this RF module with the help of HT 12E/D encoder decoder ICs
1) SMART MANDIR
2) WIRELESS ROBO CAR
This project uses HT 12E/12D Encoder Decoder ICs, RF Module and L2893D motor driver IC
3) Home Automaton Project using RF Module