Telephony refers to the technology and systems that enable voice communication over distances. It primarily involves the use of telephones and telecommunication networks to connect callers, allowing them to speak and listen to each other in real-time. This technology has evolved from traditional landline systems to include mobile phones and VoIP (Voice over Internet Protocol) services. The development of telephony has significantly impacted how people communicate, making it easier to connect with others regardless of location. Modern telephony encompasses various features, such as caller ID, voicemail, and conference calling, enhancing the overall communication experience.