Packet: A packet is the unit of data that is
routed between an origin and a destination in a network
Packet switch: Packet-switching describes
the type of network in which packets are routed
through a network. They are routed based on the destination
address contained within each packet.
Some helpful links:
https://www.youtube.com/watch?v=ewrBalT_eBM&feature=iv&src_vid=WwyJGzZmBe8&annotation_id=annotation_667002
https://www.youtube.com/watch?v=IlAJJI-qG2k