What are KB, MB, GB, and TB?
KB, MB, GB, and TB are abbreviations for the words kilobyte, megabyte, gigabyte, and terabyte. That is, 8GB would be 8 gigabytes, 1TB would be 1 terabyte, 200KB would be 200 kilobytes, and so on.
With lower case b
In some cases, KB and Kb, MB an Mb, GB and Gb, and TB and Tb have different meanings. There is a rule that the upper case B means byte, while the lower case b means bit. 1 byte is 8 bits. So 1 KB (kilobyte) would be eight times larger than 1 Kb (kilobit), since B is larger. This rule is a bit confusing and it's common for it to be ignored completely.
What is PB, EB, ZB, YB?
PB, EB, ZB, and YB would be abbreviations of petabyte, exabyte, zettabyte, and yottabyte.
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