... >> Technology >> Information Technology >> Tunnel
Definition: a private, secure link between two distant places that connects two local-area networks. For example, a company with two main offices may establish a tunnel between them using dial-up modems, leased telephone lines, or a secure (encrypted) connection over the Internet.
Source: Downing, Douglas, et al. Dictionary of Computer and Internet Terms. 10th ed. New York, 2009. Print.