Why should one add ID to their HTML tags?

Question

A simple question: why should we add the id into our HTML tags if they work perfectly well without them? I know that one of their uses is being able to navigate

Answer 1

I myself also prefer class for styling through CSS but sometimes you need an element to be unique. For accessibility reasons you use id to input elements to "connect" its label to it by using for attribute. And for Javascript it's much simpler to select an element if it has got id attribute.