What is HTML tag ?

A HTML file is always made using tags. Mainly, there are two types of tags in the HTML file. 
They are Container Tag and Empty Tag.

<!DOCTYPE html>
 <html>
    <head>
      <title> 3schools</title>
    </head>
    <body>
      <h1>This is heading 1</h1>
      <h2>This is heading 2</h2>
      <h3>This is heading 3</h3>
      <h4>This is heading 4</h4>
      <h5>This is heading 5</h5>
     </body>
  </html>

Container tag always contains START TAG AND END TAG.
Such as : <html> .... </html>
Empty tag does not contain end tags.

Example - 

  <input type='text' value='this is empty tag'/>
start tag = <html>,<p>,<h1>... and end tag = </html>,</p>,</h1>

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