A Boolean has one of two possible values: `true`; `false`. Boolean (logical) operators (*and*, *or*, *not*) take Boolean inputs and yields a Boolean value. Comparison operators on other types ([numbers](/microbit/reference/types/number), [strings](/microbit/reference/types/string) yields a Boolean value.
The following blocks represent the true and false Boolean values, which can be plugged in anywhere a Boolean value is expected:
```blocks
true;
false;
```
The next three blocks represent the three Boolean (logic) operators:
```blocks
true && false;
true || false;
!true;
```
The next six blocks represent comparison operators that yield a Boolean value. Most comparisons you will do involve [numbers](/microbit/reference/types/number):
```blocks
42 == 0;
42 != 0;
42 <0;
42 > 0;
42 <= 0;
42 >= 0;
```
Boolean values and operators are often used with an [if](/microbit/blocks/if) or [while](/microbit/reference/loops/while) statement to determine which code will execute next. For example:
### Functions that return a Boolean
Some functions return a Boolean value, which you can store in a Boolean variable. For example, the following code gets the on/off state of `point (1, 2)` and stores this in the Boolean variable named `on`. Then the code clears the screen if `on` is `true`:
### Boolean operators
Boolean operators take Boolean inputs and evaluate to a Boolean output:
### Conjunction: `A and B`
`A and B` evaluates to `true` if-and-only-if both A and B are true:
```blocks
false && false == false;
false && true == false;
true && false == false;
true && true == true;
```
### Disjunction: `A or B`
`A or B` evaluates to `true` if-and-only-if either A is true or B is true:
```blocks
false || false == false;
false || true == true;
true || false == true;
true || true == true;
```
### Negation: `not A`
`not A` evaluates to the opposite (negation) of A:
```blocks
!false == true;
!true == false;
```
### Example
This example turns on LED `3 , 3`, if LEDs `1 , 1` and `2 , 2` are both on:
```blocks
if (led.point(1,1) && led.point(2,2)) {
led.plot(3,3)
}
```
### Comparisons of numbers and strings
When you compare two Numbers, you get a Boolean value, such as the comparison `x < 5` in the code below:
```blocks
let x = math.random(5)
if(x <5){
basic.showString("low");
} else {
basic.showString("high");
}
```
See the documentation on [Numbers](/microbit/reference/types/number) for more information on comparing two Numbers. You can also [compare strings](/microbit/reference/types/string-functions) using the `equals` function.
