Bandwidth - A measure of total amount of data transferred over a period of time, often used to measure how busy a website is. A webhost will usually base its charges on the bandwidth a website uses, ie how much data per month is requested from it.

Back-up - A backup is an extra copy of your work, eg documents, pictures etc, saved onto a removable storage medium such as CD, DVD or magnetic tape, so that if your computer is stolen or breaks down you don't lose everything.

Bluetooth - A short range wireless data communication system for smartphones and other computing devices. However Bluetooth devices from different manufacturers wouldn't always communicate with each other reliably,

Browser - A program used for viewing the World Wide Web pages on the internet.

 Broadband - Refers to high speed internet services, such as ADSL.