The Image Gallery serves as a way to have your images appear on screen in a way that is visually appealing.
You can feature it as a Grid or as a Carousel.
Grids are a way to feature all images at once in a grid like fashion.
A carousel is a way to feature a collection of images is to rotate the images in such a fashion that they look presentable but doesn’t have all the images on-screen at once.
You can arrange the amount of images on the screen by selecting the number of columns.