HTML 5 is an updated version of HTML. It’s much similar to HTML. But difference is HTML 5 contains much better support for media such as, an audio and Video tag.
HTML 5 have following new media tags:
<audio> Defines sound content
<video> Defines a video or movie
<source> Defines multiple media resources for <video> and <audio>
<embed> Defines a container for an external application or interactive content (a plug-in)
<track> Defines text tracks for <video> and <audio>
HTML5 is not only an upgrade in the code, but it is a methodology, a new way of looking at your code. The new tags are very noticable as a way to organize the elements of the page, instead of just using <div>, but these also help with eReaders and other AI devices that can't determine the use for the div. The <figure> tag denontes an image, the <video> tag is wonderful because it allows browers to use video features (for instance you can add the controls attribute to use play/stop controls in your browser).