In telecommunication, a telecommunications service is a service provided by a telecommunications provider, or a specified set of user-information transfer capabilities provided to a group of users by a telecommunications system.

Telecommunications, also known as telecom, is the exchange of information over large distances. It's a broad term that includes various sectors, but all include a transmitter and a receiver. The medium of signal transference can be via various means—fiber, electromagnetic fields, light, cable, etc.

This is a broad term that includes a wide range of information-transmitting technologies and communications infrastructures. Examples include wired phones, cellphones, microwave communications, fiber optics, satellites, radio and television broadcasting, the internet and telegraphs.