define and describe what “CSS” is. Solution CSS stands for Cascadind Style Sheets. It is a stylesheet language that acts as the presentation layer for markup languages such as HTML and XHTML. The presence of CSS allows us to seperate the layout component from the information component. In essence ,the HTML document becomes the information component,while the CSS Style Sheet becomes the layout component. The main intension of CSS is to maintain the look and feel of the site consistently through out all the pages. Syntax of CSS decleration is as follows: selector { property :value; ...... } There is no limit on the number of property : value pair that can be specified for aselector. There are three main types of selectors :type selectors,class selectors,and ID selectors. Type selctors are existing (X) HTML tags such as <body> and <h1>. CLass and ID selectors are user defined selectors. Styles are typically specified in a property value pair. .