With such amazing developments in the technological world especially with the more recent development of the Internet, radio can often be thought of as a bit old fashioned.
Of course this is not the case and the use and progression of radio itself is still continuing at a very fast pace.
One of the earliest adoptions of radio was it's use in the maritime industry. Telegraphic messages are still used today to send messages between ships and the land, as well as themselves.
The word radio itself for many conjures up images of the 'wireless'. It's still in use today, but with less popularity than in it's heyday, with all the other forms of media that are now so prevalent. Originally all broadcasts came via and AM. AM is Amplitude modulation. Later broadcasts developed into FM which had a higher level of fidelity and was not susceptible to the same levels of static, or interference.
Television pictures come from an AM signal and originally when mobile, or cell phones were first developed they also made use of FM signals, although this has now changed.
It's also interesting to note that radio is still playing a major role in the maritime sector and not just in the maritime sector but for navigation in every sector, with the use of satellite systems.
RADAR is also based on radio waves, although most of the new systems that are produced are digital ones. Basically radio waves are bounced off different objects. The position of these objects are then determined by the amount of time it takes the reflection. The process can also be used to determine the direction and the type of surface of the object.
Radio is also used in others areas that many people might not think of. Examples of this would be in surgery where people can find radio being used to seal blood vessels using diathermy equipment. It's also used to heat up food and drinks in a microwave oven.
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