What is the difference between .className('') ​​and .classList.add('')?

Question

JavaScript

Hello dear experts! In the process of learning JS, a question appeared:
.getElementById('id').className = 'class'
.getElementById('id').classList.add('class');
what are their differences (I mean .className and .classList) ?
Thanks for answers!

Answer 1

tyts , tyts

Answer 2

className - string
classList - object, it's faster and easier to work with. But there is no replace in it, it is replaced by toggle