title: what is the difference between annotations and decorators in angular2
body: <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>@Component({
    selector: 'app',
    template: 'Hello World!'
  })
  class MyComponent {}</code></pre>
  </div>
  </div>
  </p>
  
  <blockquote>
    <p>what are the differences between annotations and decorators in angular2/4?
    how we can use the annotations and why?
    when we use decorators and why?
    what is tha image annotation
    Example: how i can do tag annotation for apicture in angular2/4
    if any one have  example please share it to me</p>
  </blockquote>
  
  <p>Thank you in advance </p>