Working With Bump Maps In Affinity Photo

What is a bump map and how do we use them within our designs with affinity photo to make images stand out better. Images to download https://everytexture.com/everytexture-com-stock-metal-texture-00081/ https://everytexture.com/everytexture-com-stock-wood-texture-00057/ https://pixabay.com/illustrations/sphere-ball-plastic-round-3d-953962/ https://pixabay.com/photos/wall-brick-structure-background-3671612/