Like OR and AND operation, the **NOT Operation** is also an important function in the digital electronic circuit. It is denoted by a bar. The binary not operation is also known as **not function** or **complement function** or **bit invert function**.

The not operation has only one input and one output**. **The input and output of the not operation are either zero or one. In the negative logic, 0 stands for high and 1 stands for low signals. The not operation will always produce a 0 out if their input is 1 and if their input is 0 then it produces the output, 1.

Their operation is analogous to a negative operation which has single input and output. This operation is explained by the example shown below:

**Example:** Consider the word statement ** Z = A Not A**. In boolean algebra it is expressed as:

For the given operation the output can be expressed as:

The** NOT operation** is an inversion as shown below by the truth table. It is read as “ not x is equal to z”.

x | z |
---|---|

0 | 1 |

1 | 0 |

When the value of x is equal to 0 the value of z is equal to 1. When x is equal to 1 the value of z is equal to 0.

** Also See:**: AND Operation

** Also See:** OR Operation