The unit symbol `` KB '' is a commonly used abbreviation for `` kilobyte '' but is often confused with the use of `` kb '' to mean `` kilobit '' .

For example , `` MB '' means `` Megabyte '' and `` Mb '' means `` Megabit '' . It 's easy to confuse the two , but bits are much smaller than bytes , so a lowercase `` b '' should be used when referring to `` bits '' and an uppercase `` B '' when referring to `` bytes '' .
