Difference between Element and Component.

An Element is a plain object describing what you want to appear on the screen in terms of the DOM nodes or other components. Elements can contain other Elements in their props. Creating a React element is cheap. Once an element is created, it is never mutated.

The object representation of React Element would be as follows:

const element = React.createElement(
  'div',
  {id: 'sign-in-btn'},
  'Sign in'
)

The above element renders to the DOM using ReactDOM.render():

<div id='sign-in-btn'>Sign in</div>

a component can be declared in several different ways. It can be a class with a render() method. Alternatively, in simple cases, it can be defined as a function. In either case, it takes props as an input, and returns a JSX tree as the output:

const Button = ({ onSignIn}) =>
  <div id={'sign-in-btn'} onClick={onSignIn}>Sign in</div>

Then JSX gets transpiled to a React.createElement() function tree:

const Button = ({ onSignIn}) => React.createElement(
  'div',
  { id: 'sign-in-btn', onClick: onSignIn },
  'Sign in'
)

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