Explain about Bus of register transfer

Since a computer has   several registers, paths must be provided to transfer information among registors. If separate lines are used among each register and all other registers, number of wires will be extreme in the system. A more resourceful scheme for transferring information among registers in a multiple-register configuration is common bus system. A bus structure consists of a group of common lines, one for each bit of a register, by which binary information is transferred one at a time. Control signals decide which register is selected by bus during each particular register transfer.