Valid CSS

CSS, or Cascading Style Sheets, is the behind-the-scenes web language that makes your web pages look good. CSS also helps search engines such as Google and Yahoo recognize your pages. This makes it more likely that people will find your web site when they type in a search.

As an end user of web pages, you do not need to worry too much about this. But if you are having someone create a web site for you, be sure to ask them if they use CSS. If they do, you will be on the way to having a quicker and more responsive web site that will be easier to update in the future, and will keep both the reader, the search engines happy!