Having a low quality image will make so that the file size be a lot smaller at the cost of the image being a lot more pix-elated, below this is an example of a low quality image this means that the computer doesn't have a lot of pixels Having a high quality image will make the full file size really big and intern make it take up a lot more storage, below is a high quality image as you can tell it has a lot more pixels which alows the computer to make it look high quality making website you would want to use JPEG or PNG this will make it so you can have a high image quality but you would rather have a mix of high quality images and low quality and this will make the websites performance balance it out, whilst if you were to add all high quality image the website will not have the best performance, also using certain images will increase the amount of money that you will need to either to heir the photographer to take the pictures or to licence the images...