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In IT (information technology) a packet is formatted unit of data carried by a packet mode computer network. Other networks, that don't support packets, such as point-to-point telecommunications links, simply transmit data as a series of bytes, characters or bits alone.
When data is formed into packets, the bitrate of the communication medium can better be shared among users than if the network were circuit switched.
When any file (e-mail message, html file, image, graphic or anything) is sent from one place to another via the internet, the TCP (Transmission Control Protocol) divides the files into chunks to an efficient size for transferring. When all these packets arrived they are then reasssembled into the original file.
According to Wikipedia Packet (information technology) is:
"In information technology, a packet is a formatted unit of data carried by a packet mode computer network."