metadata

Data about data. For example, the title, subject, author, and size of a file constitute the file's metadata.

modem (modulator/demodulator)

A device that enables computer information to be transmitted and received over a telephone line. The transmitting modem translates digital computer data into analog signals that can be carried over a telephone line. The receiving modem translates the analog signals back to digital form.

multimedia streaming

Playing audio and video immediately as it is downloaded from a network, rather than storing it in a file first.

Nslookup

A command-line tool used to diagnose DNS infrastructure.