Megabit
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The megabit is a unit of information storage, commonly abbreviated "Mbit".
1 megabit = 106 = 1 000 000 bits or 220 = 1 048 576 bits (see Binary prefix).
The megabit is most commonly used when referring to data transfer rates in internet and network speeds, e.g. a 100 Mbit/s Fast Ethernet connection. In this context, like elsewhere in telecommunications, it always equals 106.
However, when used to express the capacity of memory modules (including video game cartridges), it always equals 220 bits (1/8 mebibytes).
The megabit is closely related to the mebibit, which is unambiguously equal to 220 = 1 048 576 bits.