Packet Switches - Using digital transmission technology, data is broken down into code that computers understand (packets) and then sent to their correct destinations over a network. Such networks include the Internet. https://en.wikipedia.org/wiki/Packet_switch

See Circuit-switching Networks.
 
Packet-Switched Networks - Networks which use packet switching.

Packet Switching - Packet Switching describes how data is configured when being transmitted through the Internet.  Data is broken into “chunks” and sent to an address.  These chunks of data are directed by routers, gateways, servers, etc. through many different routes to their destination.  https://en.wikipedia.org/wiki/Packet_switching

Packet