A lowercase "b" in Kbps means bits, while an uppercase "B" means bytes. There are eight bits in a byte.
File download speeds from your web browser are reported in bytes-per-second or kilobytes-per-second (kBps).
The speed of your dial-up ADSL or cable modem is listed in terms of bits-per-second or kilobits-per-second (kbps).
An uppercase "B" in KBps means bytes, while a lowercase "b" means bits. There are eight bits in a byte.