A modem is a device that connects your computer to the internet. It modulates and demodulates signals, converting digital data into analog signals that can be transmitted over telephone lines or cable lines, and vice versa. Modems allow computers to communicate with each other and access the internet.
Modems have been around for decades, and they have evolved significantly over time. The first modems were very slow, but modern modems can transmit data at speeds of up to several gigabits per second. Modems are essential for businesses and individuals who need to access the internet, and they are also used in a variety of other applications, such as fax machines and credit card terminals.