Kilo bits per second is a unit of measure used for Download and Upload speeds, and specifies the number of bits in multiples of 1024 bits that can be transferred within a network or between networks in any given second.
kbps and kbits/s are both lowercase short for Kilo bits per second, and should never be confused with kBps or kBytes/s.
kbps and kbits/s are both lowercase short for Kilo bits per second, and should never be confused with kBps or kBytes/s.