How can we define html5? [closed]

HTML5, in its self is simply a revised version of HTML.
It more or less complements the use of CSS3 and Javascript but its just plain ‘ol HTML without.

Have a look here..

HTML 5, W3 Schools

Some of the newer HTML5 tags can actually enhance your site’s visibility in search engines by pointing out important aspects, like main articles and their authors for example.

HTML5 Helps Improve your SEO

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