Spring-Loaded
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Parallax is the difference in visual displacement between two or more objects. This is achieved in most 2D games by having objects in the fore/background move in a way that convinces the viewer they are actually in the fore/background as the player moves through the level. a mountain in the distance scrolls past slower than the actual playable area while trees closer to the "camera" pass by more quickly.
When this isn't done well, prepare to vom
While some of the parallax in Earnest Evans for Sega Mega-CD/Genesis was neat, it often was nauseating, especially this part, even though it's just a chain in the foreground.

When this isn't done well, prepare to vom
While some of the parallax in Earnest Evans for Sega Mega-CD/Genesis was neat, it often was nauseating, especially this part, even though it's just a chain in the foreground.