Parallax scrolling is a technique in computer graphics and web design, where background images move by the camera slower than foreground images, creating an illusion of depth in a 2D scene and adding to the immersion.
The technique grew out of the multiplane camera technique used in traditional animation since the 1930s. Parallax scrolling was popularized in 2D computer graphics and video games by the arcade games Moon Patrol and Jungle Hunt, both released in 1982.
Web designers are now using parallax for their website design, it can be some simple parallaxing effect with background images (see ourHome Page), or some website entirely designed based on Parallax effects (seeTedxGuc)
The very important thing when using Parallax is to concider it’s purpose and your users, too much parallaxing can distract the user from the content and the important information you want to provide, also users with old computers will struggle navigating on your website as using a lot of parallax effects can make your website heavy.
In the other hand if you are a design based company for exemple, you want the visual to be astonishing therefore having a fully parallax based website is not an issue until you make it as light and smooth as possible.
For more information about parallax, take a look atInstantshift Parallax Scrolling Designs.
You can also learn about Pure CSS parallax effects here :Pure CSS Parallax Websites