Without the communications aspect of the home PC, most would not find a need to even own one.
Most people buy a PC in order to go online.
For this reason, the hardware necessary to get onto the internet and to network is of the utmost importance. A modem is a device that lets your computer communicate with other computers over a standard telephone line. This term means that the modem converts the digital information from your computer to an analog signal that can travel over phone lines. Then the receiving modem converts the analog signal back to a digital signal for the receiving computer to work with. Some modems can exchange data only.