Component

// Function Component
// Well, as you know, function components are a little limited. 
// All they know about is their current props. They can’t access previous props or external state. 
// And they’re only re-rendered when their parent is; they can’t be re-rendered individually.
// 
// class components give you the power to store state, communicate with the outside world, 
// and re-render whenever you’d like. But class components can be simple, too! In fact,
// any function component can also be implemented as a class component.
//