CSS (cascading style sheet) is a style sheet language used to describe the look and formatting of a document written in HTML.it is used to define the styles of elements on a web page, such as the font, color, size, and layout of text and others elements

it is important to web dev for styling and responsive design, reusability and animation.

we learn css to make fast page speeds, better UX and quick dev time, easy formating changes and compatibility across devices.