Often there is much confusion about the terms Mb, the abbreviation of megabits, and MB, the abbreviation of megabytes. To solve this confusion once and for all, we'll explain both of them. A megabyte is equal to eight megabits. That is, if you subscribe for 20 Mb - megabits - you can download up to 2.50 megabytes per second. In other words, one megabit is eight times as small as one megabyte.