Mbps (Megabit per second)

A unit of data transfer rate equal to 1,048,576 bits per second or 1,024 kilobits per second.

Data rate is also often measured in Kbps or Gbps:

1 Mbps = 1024 Kbps

1 Gbps = 1024 Mbps

The "Mb" in Mbps should not be confused with MB, which stands for megabytes, a very different kind measurement.