"Web standards are intended to be a common base.... a foundation for the World Wide Web so that browsers and other software understand the same basic vocabulary."
Eric Myer, Netscape Communications
Web Standards are about accepting the web as a broad communication tool that can be accessed by a wide variety of users and devices.
Common characteristics include: semantically correct mark-up, valid code, accessible code (for humans and devices) and cascading style sheets (CSS) to separate content from presentation.