The id and class Selectors in CSS

To set a style for a HTML element, CSS allows you to specify your own selectors called

1. id selector and
2. class Sselector

The id Selector:

The id selector is used to specify a style for a single, unique element. The id selector uses the id attribute of the HTML element, and is defined with a "#".

The class Selector:

The class selector is used to specify a style for a group of elements. This allows you to set a particular style for many HTML elements with the same class.The class selector uses the HTML class attribute, and is defined with a "."

Unlike the id selector, the class selector is most often used on several elements.