Kilobyte (KB)
The kilobyte, symbolized as KB, represents 1,000 bytes in the decimal system (SI), although in computing, it is commonly approximated as 1,024 bytes. The unit emerged in the 1960s as computer memory and storage expanded and was used for measuring small file sizes, such as text documents and early software. The kilobyte reflects the practical intersection of metric and binary measurements, which led to the introduction of binary-specific units, such as the kibibyte. Kilobytes are still used in some legacy systems and file specifications.
Bit (b)
The bit, symbol b, is the fundamental unit of digital information. Short for binary digit, it was introduced in 1948 by Claude Shannon in his work on information theory. A bit represents either 0 or 1, forming the basis of modern computing and digital communication. Bits measure data transfer, storage efficiency, and computational processes. Individually small, billions of bits combine to store files, images, and programs, making the bit essential in the digital era.