What is 25mb?

Answer 1

25MB is 25 megabytes, which is 25,600 kilobytes (kB) or 26,214,400 bytes. A kilobyte is 1024 bytes (210 bytes), while a megabyte is 1,048,576 bytes (220 bytes). A gigabyte (GB) is 1,073,741,824 bytes (230 bytes). And so on for terabyte (TB, 240 bytes), petabyte (PB, 250 bytes), exabyte (EB, 260 bytes), zettabyte (ZB, 270 bytes) and yottabyte (YB, 280 bytes).

Note that 25Mbit is 25 megabits which equates to 3,276,800 bytes because there are 8 bits in a byte. Some conventions just use a lower case b to denote bits, such as 25Mb, however it is best to be explicit when referring to bits. Just to add to the confusion, the International Electrotechnical Commission (IEC) symbols are KiB, Mib, Gib, etc for bytes, and Kibit, Mibit, Gibit, etc, for bits.