# Chapter 18: Rendering a Parallax Background

In this chapter, we'll go through the implementation of a parallax background, which is a technique used in 2D games to give a sense of depth.

The `ParallaxLayer` struct represents a single layer in our parallax background. Each layer has its own texture and speed, creating a sense of depth by moving slower the further it is from the viewer. The `ParallaxBackground` struct manages multiple layers, rendering and updating each layer.

The `render` method of a `ParallaxLayer` handles drawing the layer's texture to the screen, taking into account the layer's offset and the position of the camera. The `update` method adjusts the layer's offset based on its speed and the elapsed time.

The `ParallaxBackground`'s `render` and `update` methods simply call the corresponding methods on each of its layers.


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