the amount of data that can be transferred to or from memory per second
Bit rate In digital communication systems, the physical layer gross bitrate,[5] raw bitrate,[6] data signaling rate,[7] gross data transfer rate[8] or uncoded transmission rate[6] (sometimes written as a variable Rb[5][6] or fb[9]) is the total number of physically transferred bits per second over a communication link, including useful data as well as protocol overhead.