Before HTML5, there was no standard way to embed video into web pages.
Until now, multimedia content on the Web has been placed in web pages by means of third-party plugins or applications that integrate with the
web browser. (QuickTime, RealPlayer, and Silverlight.)
The most popular way to embed video and audio on web pages is by means of Adobe’s Flash Player plugin.
The introduction of the video and audio elements in HTML5 resolves this problem and makes multimedia a seamless part of a web page, the same as the img element.
With HTML5, there’ s no need for the user to download third-party software to view your content, and the video or audio player is easily accessible via scripting.