RADIO
FM
FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation (FM) to provide high-fidelity sound over broadcast radio. The term "FM band" describes the "frequency band in which FM is used for broadcasting". This term is slightly misleading, since it equates a modulation method with a range of frequencies.
DIGITAL RADIO

Digital radio is when the communication travels through digital frequency.

         1. Today the most common meaning is digital radio broadcasting technologies. In these systems, the analogue audio signal is digitized, compressed using formats such as mp2, and transmitted using a digital modulation scheme.

       2. An older definition, still used in communication engineering literature, is wireless digital transmission technologies, i.e. microwave and radio frequency communication standards where analogue information signals as well as digital data are carried by a digital signal, by means of a digital modulation method.
       3. A less common definition is radio receiver and transmitter implementations that are based on digital signal processing, but may transmit or receive analogue radio transmission standards, for example FM radio.

INTERNET RADIO

Internet radio (also web radio, net radio, streaming radio, e-radio webcasting) is an audio service transmitted via the Internet. Music streaming on the Internet is usually referred to as webcasting since it is not transmitted broadly through wireless means.

Internet radio involves streaming media, presenting listeners with a continuous stream of audio that cannot be paused or replayed, much like traditional broadcast media; in this respect, it is distinct from on-demand file serving. Internet radio is also distinct from podcasting, which involves downloading rather than streaming. Many Internet radio services are associated with a corresponding traditional (terrestrial) radio station or radio network. Internet-only radio stations are independent of such associations.

What’s better about internet radio is you can listen to any station at anytime. For example instead of having to wait for it to come on FM radio at a certain time.