A transceiver is a device that can both transmit and receive signals, commonly used in communication systems. It combines the functions of a transmitter and a receiver, allowing for two-way communication. Transceivers are essential in various applications, including telecommunications, radio, and networking. In networking, transceivers are often used in fiber optic and Ethernet connections to facilitate data transfer over long distances. They convert electrical signals into optical signals and vice versa, enabling efficient communication between devices. This versatility makes transceivers crucial for modern communication infrastructure.