It is abbreviated in a number of ways: kB, KB, K and Kbyte.
Some have suggested that the capitalized prefix K be used to distinguish this quantity from the SI prefix k, but this has never been formally mandated. Further, it is not extensible to higher-order prefixes, as SI already uses the prefixes m and M to mean "milli-" and "mega-" respectively. There are also proposals to capitalize all greater-than-unity prefixes (D, H, K, M, G, ...), which would conflict with this. See SI prefix.
These prefixes are therefore used with either decimal (powers of 1000) or binary (powers of 1024) values, depending on context:
Kilobyte (abbreviated as "KB") is not to be confused with the term kilobit (abbreviated as kb).
To make it simple, there are 1000 KB in a MB, and there are 1000 MB in a GB, and so on so forth...
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