HTML5 Semantic Tags | What do they mean

HTML markup has changed a lot especially when the WHATWG introduced semantic tags.  
Semantic Tags? What do they mean. The Semantic Markup helps Humans and Machines to Interpret the HTML markup in a more meaningful way. Which helps the HTML markup to be structured in a more meaningful way. remember adding semantic tags to your HTML5 markup wont change the apperance of your page, but it Gives more meaning to your Markup.  
Here is a list of few HTML5 semantic tags.

• <section>  </section>
• <article>  </article>
• <header>    </header>
• <nav>          </nav>
• <aside>      </aside>
• <footer>    </footer>

As you see above the above tags wont make our web pages pretty but it gives more meaning to the markup.