The modem is the short form of Modulator-Demodulator. It is an electronic device which converts computer’s digital signals into some specific frequencies which travel over telephone or cable television lines.

Computers generally use modems for communication with each other over a network. So overall Modem is a signal which is used to transmit data easily and reproduce the original digital data.

It does bi-directional communication via radio frequency channels on Hybrid Fibre-Coaxial (HFC) and Radio Frequency over Glass (RFoG).

What are the types of Modem?
Modems are different types and it is categorized on the basis of services

Cable Modems
DSL Modems
Satellite Modems
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1. Cable Modems:

The cable modem is a medium which works through a cable provider. It does bi-directional communication via radio frequency channels on Hybrid Fibre-Coaxial (HFC) and Radio Frequency over Glass (RFoG). This modem gives broadband internet access in the form of cable internet by taking high bandwidth of HFC and RFoG.

2. DSL Modems:

Digital Subscriber Line (DSL) is a device which is used to connect personal computer internet. It gives services for connectivity to the internet. DSL service allows a user to talk on the phone and simultaneously access the internet. DSL modems use either the USB port or Ethernet port.

3. Satellite Modems:

Now satellite modems are not used much. Because it is slow and hard to come by, It gives services through satellite. This modem is usually only in remote locations

The main function of this modem is to transform an input bitstream to a radio signal.

Types of modems

How does Modem work?
The modem used to send digital information over a telephone line. Frequency shift keying used for converting purpose. Then the modem modulates the digital data into a signal that can be decoded by phone line. Phase shift keying was the first technique which was made the modems faster.

Conclusion:
If you want the best modem connection, then you need to develop the internet speed as well as the best computer hardware. Above given modems are now in use. But satellite modem is in less useful because it is very slow and difficult to use. So go for cable and DSL modem.