Parallax is a 3d effect used in various websites to make webpages attractive. In this effect, as we scroll, the background of the webpages moves at a different speed than the foreground making it look brilliant to the eyes.
This effect is a great visual but an easy method to implement with the help of CSS. First, let us understand what is happening in the given examples. The effect is created because the image in the background is kept fixed with no movement but other text content are moving. This simple technique makes this effect look brilliant.