8-bit serial-in/serial-out or parallel-out shift register with output latches, 3-state.
You can use this shift register to control 8 outputs at a time while only taking up a 3 pins on your microcontroller. You can link multiple registers together to extend your output even more.
"3 state" refers to the fact that you can set the output pins as either high, low or "high impedance." Unlike the HIGH and LOW states, you can"t set pins to their high impedance state individually. You can only set the whole chip together