A cookie that is stored temporarily and is destroyed when you close the link WordNet 3.0 & Open English WordNet

A packet of information sent by a server to a World Wide Web browser and then returned by the browser each time it accesses that server, used to maintain state between otherwise stateless HTTP transactions, for example, to identify the user. Wiktionary

Packet of information sent by a server to a World Wide Web browser and then returned by the browser each time it accesses that server. Wiktionary (translation)