A telephone system is a network that allows people to communicate over distances using electronic devices. It typically consists of a telephone, which converts sound into electrical signals, and a switching system that connects calls between different users. Modern systems can be either analog or digital, with digital systems offering clearer sound quality and additional features. There are various types of telephone systems, including landline, mobile, and VoIP (Voice over Internet Protocol). Landline systems use physical wires, while mobile systems rely on cellular networks. VoIP systems transmit calls over the internet, making them cost-effective and versatile for both personal and business use.