"A digital or new media agency is a business that delivers services for the creative and technical development of internet based products. These services range from the more generalist such as web design, e-mail marketing and microsites etc. to the more specialist such as viral campaigns, banner advertising, search engine optimization, podcasting or widget development"
Here are the few things being described to give you a clear idea about the features of good web design. Take a look at the given review that lists the fundamental aspects of design in a regular website: