1> semantic tags

is an element clearly describes its meaning to both the browser and the developer (human-and-machine readable way

-> elements like header, footer, and article describes the purpose of the element and the type of content that is inside them```

<header></header>
<section>
	<article>
		<figure>
			<img>
			<figcaption></figcaption>
		</figure>
	</article>
</section>
<footer></footer>

2> semantic web

aka Web3.0, machine-readable
is an extension of the World Wide Web through standards set by the World Wide Web Consortium (W3C), makes internet data machine-readable.