Communication systems encompass the formal and informal processes used to transmit information between management and employees within a business, or between the business and external parties. In the realm of telecommunication, a communications system is an integrated whole formed by the interconnection and interoperation of individual communications networks, transmission systems, relay stations, tributary stations, and data terminal equipment (DTE). The components of such a system share a common purpose, are technically compatible, use unified procedures, respond to controls, and operate in unison.