What is the `<nav>` tag?

In 14/14, the <nav>-tag suddenly appears in the code, without a proper introduction. Without the the page seems to be working fine. Can somebody explain?

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HTML tags are not functional, but semantic. Their meaning can be found in the tagname. NAV says what its children represent, navigation links. It is a sectioning element for flow content; i.e., links.

Something to keep close by when learning HTML is the chapter on elements.

the NAV element