networking and internetworking

See http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm

"An internetwork is a collection of individual networks, connected by intermediate networking devices, that functions as a single large network. Internetworking refers to the industry, products, and procedures that meet the challenge of creating and administering internetworks."

To put it simple: Networking is when you make to computers talk to each other using a Local Network. InterNetworking is when you connect 2 or more Local Networks together. You can look at a local network being defined as local network becuase:
In plain english: It is local, in the same building using local means for communication (local wiring)
In technical terms: A local network is one that allows broadcasting and doesn't need any routing to take place in order to reach another computer. Internetworking requires routes in order to reach the remote computer/network.