8-bit may refer to any of the following:
1. 8-bit is an early computer hardware device or software program that is capable of transferring eight bits of data at the same time. For example, the Intel 8080 processor, which was one of the first widely used computer processors ran on a 8-bit architecture. Today's computer processors are 64-bit.
2. When referring to a video card or graphics card, 8-bit refers to the amount of colors capable of being displayed. For example, 8-bit is the same as 256 colors.
3. There are also 8-bits in a byte.