CSS means cascading stylesheet it is use to design a website it increses the beauty of the website by providing different types of colors which makes the website looks attractive without css the website seems to appear dead .There are three types of css number one is Inline css which is used inside the tag element using inline css we can only design one tag at a time to give design the tag with same we will have to give design this tag separately.second one internal css which is used inside the head tag using style tag on which we select the tag we want to give design and the tags having same name will get the same color or other attributes we don't need move to each tag having same name.third one is external css on which we make different file for css and uses a link tag on the html page to access the external file