Parallax Background

Fixed and parallax background images are a great way to add beautiful imagery to your website But what exactly is the difference?
 To answer this question effectively. When using a fixed background image, the image will remain static, while the content will move
 over the image as your scroll down the page.When using a parallax background image, both the image and the content will move as your
 scroll down the page, but at different speeds. This effect is known as the parallax scrolling, where background content is moving 
 slower that foreground content. Take a look at the live  theme demo for Create, a WordPress Theme by Themetrust. There is an excellent
 example of a parallax background image  in use on the coffee shop homepage.