session

session: A logical connection created between two hosts to exchange data. Typically, sessions use sequencing and acknowledgments to send data reliably.

In the context of load balancing TCP/IP traffic, a set of client requests directed to a server. These requests can be invoked with multiple, possibly concurrent, TCP connections. The server program sometimes maintains state information between requests. To preserve access to the server state, Network Load Balancing needs to direct all requests within a session to the same cluster host when load balancing.