Id Vs Class

An id is a unique identifier for a single HTML element. A class is a reusable identifier that can be applied to multiple elements.

You’d want to use an id when you need to address a single element either through CSS or JavaScript. And you’ll want to use a class when you need to address a group of DOM elements.

In CSS:

• #id selects a specific element with that id.
• .class selects all elements with that class.