Megabit = Mb. Megabyte = MB.

25 Mbit/s = 25 Mb/s. 25 Mb/s ≠ 25 MB/s.

Generally I see Mbps when referring to megabits per second and MB/s for megabytes per second.

While others have correctly pointed out that 25 Mbits/s does in fact equal 25 Mb/s, (though, I always use Mbits/s, just to eliminate the confusion) - I'd also like to note that bandwidth is always measured in SI Mbits - I.E. 25 Mbits/s of bandwidth is always 25,000,000 bits/second.

Any time you see someone call it out explicitly as 25 Mib/s, double check and see if that's what they actually mean - 90+% of the time it isn't.

Netflix's results use Mbps too.