Boolean

Booleans are used for stating true or false which I will demonstrate with an example:

let isLoggedin =true;

let gameover=false; Const iswaterwet=true;

Variables can change types which I will show with an example:

let numpuppies=23; //number

numpuppies=false; //now a Boolean

numpupies=100; // back to number

To note: doesn’t make sense to change from number to Boolean but it’s possible to do so.

In other programming language, its common when making a variable if a number that your storing ,that variable can only store number or variable can store boolean value.