Definition - What does NOT Operator mean?
In Boolean algebra, the NOT operator is a Boolean operator that returns TRUE or 1 when the operand is FALSE or 0, and returns FALSE or 0 when the operand is TRUE or 1. Essentially, the operator reverses the logical value associated with the expression on which it operates. The NOT operator is considered one of the basic operators along with AND and OR in Boolean algebra.
The NOT operator is also known as the logical NOT.
Techopedia explains NOT Operator
In digital electronics, the NOT logical operator allows the user to express conditions in a negative manner. If a condition is true, then the logical NOT operator makes it false, and vice-versa. As with other logical operators, the NOT operator can be combined with other logical operators to create more complex expressions. The NOT operator is used in most programming languages which support logical and comparison operators. In the programming world, it is mainly used to control the flow of the program. It is used in construction of logical statements and in supporting bitwise negation. It is also an important component while setting up logic digital circuits.