Today there are generally 2 ways of describing data transfer speeds: in bits per second, or in bytes per second. As explained above, a byte is made of 8 bits. Network engineers still describe network speeds in bits per second, while your internet browser would usually measure a file download rate in bytes per second. A lowercase "b" usually means a bit, while an uppercase "B" represents a byte.
Bps
Known as bits per second, bps was the main way of describing data transfer speeds several decades ago. Bps was also known as the baud rate, therefore, a 600 baud modem was one which could transfer data at around 600bps.
Kbps
kilobits per second, or 1000 bits per second.
Mbps
1,000,000 bits per second (usually used in describing internet download/upload speeds).
Gbps
1,000,000 kilobits per second or 1,000,000,000 bits per second. This term is most commonly heard in local area networks, where the close proximity of machines allows for lightning fast data transfer rates.
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