What is a Parallax Effect?

In a website design word parallax is a technique where background images move at different speed slower than the foreground images. The goal is to create an illusion of depth in a 2D environment. You can use parallax effect on landing pages, longform content, or homepage of a business website. This effect is mainly used for adding highlight to different sections on a long page.

Method 1: Add Parallax Effect Using a Plugin

This method is easier and suggested for most users. It doesn’t require you to add any code to your WordPress theme

http://www.imfaceplate.com/sabrinedalena123/how-to-easily-add-a-parallax-effect-to-any-wordpress-theme