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>
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.