https://techcrunch.com/2017/09/12/apples-iphone-8-portrait-lighting-lets-mobile-photographers-mimic-studio-effects/

Apple has a new feature for its iPhone 8 camera called ‘Portrait Lighting’ that works in addition to its existing Portrait Mode. The feature uses machine learning to analyze the images taken with the camera in real-time, letting you change the lighting effects either in preview, or after you’ve taken the photo using the Photos app.

This is another step Apple has taken to make advanced photography effects available on the camera you have with you everywhere. Portrait Mode last year allowed for users to create a sense of depth of field with a simulated bokeh effect which blurs the background, and the new mode goes further – allowing lighting tweaks that would ordinarily not be possible either outside of a studio setting, or with expensive pro lights.