a register whose bits propagate one cell to the left when the clock ticks

a series of flip-flops with each output Q connected to the next input D, and the clock inputs connected together

a string of flip-flops or bistable multivibrators which are connected such that the states of the individual flipflops contain the information stored

Digial circuit that accepts binary data from some input source and then shifts this data through a chain of flip-flops one bit at a time.

In digital circuits a shift register is a group of registers set up in a linear fashion which have their inputs and outputs connected together in such a way that the data is shifted down the line when the circuit is activated.