| Word | Description |
| B2B | Business-to-business electronic commerce. |
| B2C | Business-to-consumer electronic commerce. |
| Backhaul | A communications link that is used for carrying aggregated traffic from a local community back to a central location where services are managed. |
| Backup | Backup, or backing-up, refers to making a copy of data, files and databases to preserve a relatively current copy in case something should happen to the current data, such as corruption or deletion. |
| Bandwidth | Refers to the speed and how much data (capacity) a network link can transmit, which is usually measured in bits per second. |
| Banner ad | An advertisement that typically runs across a web page or is positioned in a margin or other space reserved for ads. It is usually animated and tending to conform to standard sizes so that the file displays quickly. |
| Barcode | A series of vertical lines that contain information about a product, document or service. A scanning device is required to extract the information from the barcode, which is then presented in a user-friendly format. |
| Baud | Modem speed measured in signals per second. |
| Bit | Binary digit – either a zero or a one. Complex information (characters, numbers, email messages, documents, sound files, video files etc) can be stored and communicated as a sequence of bits. |
| Bits per second | A common measurement of the data speed when transmitting electronic data. |
| Bluetooth | A communications technology that enables wireless networking, between devices such as mobile phones, laptops, personal computer, printers, digital cameras and video game consoles over a secure, globally unlicensed short-range radio frequency. The Bluetooth specifications are developed and licensed by the Bluetooth Special Interest Group. |
| BPON | Broadband PON. See PON. |
| Broadband | Fast internet network and access technology that offers bandwidths of 256kbps or more. |
| Browser | Software used to view and navigate documents on the Internet. Examples include Internet Explorer, Firefox, Mozilla and Safari |
| Bug | A coding, hardware or software fault. |