bit, bytes - A bit is the smallest piece of information that computers use. For simplicity, a PC uses bits in groups of 8 called bytes (8 bits = 1 byte).
Bluetooth - a way of communicating wirelessly over short distances between electronic devices (for example computer and mobile telephone)
boot, boot up, boot disk - You boot (or boot up) your computer when you switch it on and wait while it prepares itself. Instructions for startup are given to the computer from the boot disk, which is usually the hard disk.
browser, to browse - A browser is a program like Firefox or Internet Explorer. You use it to view or browse the Internet.
bug - A (small) defect or fault in a program.