what <nav> works for?

Question

I mean what is navigational section?

Answer 1

https://www.sololearn.com/learn/HTML/2199/
You can learn it here

Answer 2

<nav> section is used to create menus as it says "navigation" .

Nav itself is a HTML5 Semantic element like others <header>, <menu>,<nav>,<content>,<aside>,<article> ,<footer> etc and they got NO EFFECTS itself.

It works like the same as <div> which is a non-semantic element. So the only reason people use semantic elements is for SEO and easy code readability.

Uses:-
Semantic way:-
<header>
<img alt="logo">
<h1>Company Name<h1>
</header>

Non-Semantic Way:-
<div id="header">
<img alt="logo">
<h1>Company Name<h1>
</div>

learn More HTML5 Semantic Elements here:-
https://www.w3schools.com/html/html5_semantic_elements.asp

Answer 3

Nav = Navigation bars.
It's kind of comtainer of the navigation bars.
It's not necessary to use it though.