In a Packet Switching network, a packet flow or traffic flow is a sequence of packets from one particular source (e.g. a computer host, process or class of services) to a single destination (another computer host, a multicast group, a broadcast domain, a process or a class of services). As they are sent over successive data links towards their destination, the packets from one flow (e.g. A1, A2, A3) will be intermingled with packets from other flows also traversing the network (e.g. A1, B7, C9, A2, C10, A3), since packet mode switching is a form of statistical multiplexing.