What is a CSS file? For what purpose it is used?

The css is a plain content record design utilized for arranging content on website pages. CSS represents Cascading Style Sheet and is utilized by website pages to help keep data in the best possible showcase arrange. CSS documents can help characterize text style, measure, shading, dividing, outskirt and area of HTML data on a site page, and can likewise be utilized to make a ceaseless look all through different pages of a site.