What is packet - peak concepts

A packet is the unit of data that is routed between an origin of  computer  network and a destination of computer network on the Internet or any other packet-switched computer network. When any file (e-mail message, HTML file, Graphics Interchange Format file, Uniform Resource Locator request, and so forth) is sent from one place of computer network to another place of computer network on the Internet, the Transmission Control Protocol (TCP) layer of TCP/IP of computer network. 

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