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KB. From the Greek "chilioi," meaning "thousand." A unit of measurement for physical data storage on some form of storage device like hard disk, optical disk, RAM memory, etc. The actual definition can be confusing, since there are two measurements. In the metric system, a kilobyte is 1,000 bytes, or 10 to the third power. In the computer world, things tend to be measured in binary terms as 1s and 0s. In binary terms, a kilobyte is 2 to the 10th power, or 1,024. Here is the progression:

Following is a summary of sizes, in binary terms:

KB = Kilobyte (2 to the 10th power)
MB = Megabyte (2 to the 20th power)
GB = Gigabyte (2 to the 30th power)
TB = Terabyte (2 to the 40th power)
PB = Petabyte (2 to the 50th power)
EB = Exabyte (2 to the 60th power)
ZB = Zettabyte (2 to the 70th power)
YB = Yottabyte (2 to the 80th power)
One googolbyte equals 2 to the 100th power.