LR (Low Resolution) photos are photos with a low resolution, typically 480x720 pixels. This resolution ensures good smartphone or tablet display and is suitable for immediate social media sharing or for email, profile pictures or small format prints.
HR (High Resolution) photos, come in high resolution with excellent definition, typically 5600x3700 pixels. These images are taken with high quality cameras (20-24 Megapixels), and their size is at least 6/7 Megabyte. They are ideal for very large format prints too.