The Photos section allows you to upload photos to your website if you have your photo album connected to this feature. This allows for easy access and organization of your uploaded photos. From here, you may choose to add, edit, or delete a photo album from the website.
Every photo that you upload will be resized into a few standard sizes (thumbnail, low resolution, and medium resolution while the original image is turned into the high resolution option) that you can use to embed those photos inside webpages and emails, and the URLs for those images are provided on the main Photos page.
Here are a few links to other pages about using photos in your emails and webpages: