The ALU, stands for "Arithmetic Logic Unit", is a fundamental component in computers. It does all of the calculations in the computer, so basicaly everthing is using it. It is made from [Logic gates](Logic%20gates.md) and incoporate two units : the arithmetic unit and the logic unit, thus its name. Half adder : using a carry with XOR and a AND Full adder : three input and one carry, made from two Half adder and a OR gate. 8 bits adder : made from 1 half adder and 7 full adder. ## Links - [How computers calculate - The ALU](https://www.youtube.com/watch?v=1I5ZMmrOfnA)