What does the ring light mean? What does the ring light mean?

About the meaning of ring light, the explanation of computer terms

Ring flash is a kind of lamp directly installed on the camera lens, and the light-emitting tube is ring-shaped. Low power, equipped with effect light. The light is even and there is no shadow. It is very suitable for macro photography and very useful in the fields of medicine and scientific research. In close-range and macro photography, because the subject is very close to the lens, ordinary flash will produce heavy shadows, and the exposure is difficult to control. Ring flash is often used at this time.