They provide us with a new and shorter syntax for declaring functions.
Arrow functions can only be used as a function expression.
The biggest difference between the traditional function expression and the arrow function, is the handling of the this keyword.
By general definition, the this keyword always refers to the object that is calling the function.
In the arrow functions, there is no binding of the this keyword.
The this keyword inside an arrow function, does not refer to the object calling it. It rather inherits its value from the parent scope which is the window object in this case.