Provides 1 way data transmission, meaning the transmitter can only transmit information and the receiver can only receive it.
The module itself cannot work on its own as it required some kind of encoding before being transmitter and decoding after being received. so it has to be used with an encoder or decoder IC or with any microcontroller on both ends.
The module uses ASK (Amplitude shift keying) and hence it’s easy to interface with microcontrollers.