On the Web, design is not a method for implementing narrative, as it is in print, but rather it's a method for making behaviors possible. If one must compare the web to other media, typography would be a better choice. For a web design, like a typeface, is an environment for someone else's expression. Architecture (the kind that uses steel and glass and stone) is also an apt comparison — or at least, more apt than poster design. The architect creates planes and grids that facilitate the dynamic behavior of people. Having designed, the architect relinquishes control. Over time, the people who use the building bring out and add to the meaning of the architect's design. Web design is not book design, it is not poster design, it is not illustration, and the highest achievements of those disciplines are not what web design aims for. Web design is the creation of digital environments that facilitate and encourage human activity; reflect or adapt to individual voices and content; and change gracefully over time while always retaining their identity.
–Khoi Vinh