How to use the reflector for photography? What is the principle? Is it anti-flash light?

The reflector is a metal foil or a whiteboard. You can use a mirror if necessary. Use to model or fill dark parts of an object with light to control contrast. Light comes from sunlight or light. Attention should be paid to raising the reflector to simulate light similar to natural light to prevent the formation of ghost light. Choose the right color swatch according to skin color and clothing.