Some new tags that were introduced in HTML5 are header, footer, main, aside, canvas, svg, source, audio, and video. The canvas and svg are most notably used for creating online applications and games, something that was only possible before with flash.
There are much, much more possibilities of HTML5, and it is not possible to list them all here.
Here is a good resource, however: w3schools.com/html/html5_new_elements.asp
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