FM may refer to any of the following:
1. With a radio or an audio signal, FM is short for frequency modulation and was invented by Edwin Armstrong in 1933. FM is a method of transmitting a signal of greater quality at ranges of 80 MHz to 108 MHz at a shorter distance than AM.
FM is one of the main methods of transmitting data wirelessly.
2. The Internet domain suffix .fm is short for Micronesia.
3. Short for frequency modulation, FM encoding is a method of recording data to a floppy disk or hard drive platter. This encoding method is no longer used today and was replaced with MFM (modified frequency modulation).