The town of BOOL

Boolean Logic has only two values
TRUE and FALSE

There are also three key 'operators', rather like subtraction, multiplication and addition.
OR, AND and NOT

These are the basic rules:

---

NOT

NOT TRUE is FALSE
NOT FALSE is TRUE

OR

FALSE OR FALSE is FALSE
FALSE OR TRUE is TRUE
TRUE OR TRUE is TRUE

AND

FALSE AND FALSE is FALSE
FALSE AND TRUE is FALSE
TRUE AND TRUE is TRUE

Try these examples:

NOT TRUE OR TRUE is
FALSE AND NOT FALSE is
NOT FALSE AND NOT FALSE is
TRUE OR NOT TRUE is

Boolean logic and Boolean expressions are the simplest level of a computer.  We can easily create electrical circuits that allow Boolean logic to be carried out by a machine.  By combining those circuits in clever ways we can add numbers, manipulate text and, ultimately, perform all of the operations that a computer carries out.