A simple 8-bit shift register made from 8 different D flip-flops with a common clock.
The top logic source is the data input and the bottom logic source is the clock pulse.
When the clock is pulsed (goes from 0 to 1) it places the data input into the first D flip-flop and the state of each flip-flop is moved to the next. The 8th bit is shifted out and is lost thus the register can only hold 8-bits at a time.
