Booleans are values that can be only one of two things:
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.
var kitchenLights = false; kitchenLights = true; kitchenLights;
Booleans are essential for conditionals to work.