Glossary Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business. Bit Return to glossary A single unit of data, either a one or a zero, used in digital data communications. When discussing digital data, a lowercase "b" refers to bits, and an uppercase "B" refers to bytes. Eight bits are needed to create one byte or character.