The iPhone X has two cameras on the back. The first one is a wide 12 MP camera. It can record video at 1080p HD or 4K and slow-mo at 720p or 1080p. The second camera is a zoom camera at also 12 MP. Using the second camera, you can zoom optically, so the picture does not lose quality. Together, the two cameras can be used for Portrait mode, which blurs the background and keeps the object or person in focus, and Portrait Lighting, which also does the same thing as Portrait Mode, but you can actually choose how the lighting looks.