Bit- The smallest unit in computing. It can have a value of 1 or 0. You'd be hard pressed to find a file size listed in bits.

Byte - A  unit of information made up of 8 bits.

Kilobyte(KB) - A unit of approximately 1000 bytes (1024 to be exact). Most download sites use kilobytes when they give file sizes.

Megabyte (MB) - 220 bytes = 1,048,576 bytes or 1,024 kilobytes. Sometimes used to mean 1 million bytes.

Gigabyte (GB) - Approximately 1 billion bytes (1024 MB). Most hard drive sizes are listed in gigabytes.

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 A 3 1/2" floppy disk holds 1.44 Megabytes (1,474 KB).

 A CD Rom holds 650-700 Megabytes.  This would be around 450 of those 3.5 floppies.

 A 20 Gig hard drive will hold the same amount of info as 31 CD ROMs or 14,222 floppy disks.

 It takes between 7-10 minutes to download a one megabyte (1024 KB) file using the average dial up internet connection.

 A typical page of text is around 4KB.