packets - Definition from the Hotspot Shield Glossary
A packet is a single unit of data - packets are used in networking and the transmission of data. Specifically packets are routed between two destinations i.e. a client and a server, on a packet-switched network or the internet.
Standard files such as URL’s, HTML files and JPEG’s have to be broken down into small more manageable bits of information to allow ease of transport - These individual parts of data are packets. The packets will be labelled and their intended destination will be appended to the packet so it is transported to the correct end-point - Each individual packet may take a different route, but should all ultimately end up at the same final destination. When packets arrive at the end-point, they are reassembled to form the original file.