Simplicity is an important web design concept that focuses on the great and effective use of spacing in website design. Just a few years back, most of the web designers tend to fill up every available space on web page with stuff (text, images, videos etc.) and empty space were thought of as wasteful but now this has all changed with the evolution of Web 2.0. Simplicity is an essential part of Web 2.0 design strategy which stresses the need for more focused, clean and simple design.
It is a common phenomenon that if you have two solutions for a problem, than simpler one is better. Same implies to web design. Simplicity means removal of unnecessary website components and sections, without sacrificing the effective delivery of the business message. Simplicity makes things clearer, elegant and more upmarket and helps a great deal in reducing the bounce rate of any website.