Booleans

Booleans are values that can be only one of two things: true or false.
Anything “on” or “off,” “yes” or “no,” or temporary is a usually good fit for a boolean. It’s useful to store booleans in variables to keep track of their values and change them over time.

EXAMPLE
var kitchenLights = false;
kitchenLights = true;
kitchenLights;
OUTPUT
true

Booleans are essential for conditionals to work.