Define circuit switching and packet switching what are the difference of them?

Packet-switched networks move data in separate, small data blocks, or packets as they are more commonly known, based on the destination address in each packet. When received, the packets are reassembled in the proper sequence to make up the message. The packets are not dependent on any one path or connection, and can take as many paths as necessary to maintain data integrity depending on traffic load of a shared network. Packet-switched networks are mainly used in standard LAN networks.

Circuit-switched networks require dedicated point-to-point connections during calls.