Why is the shadowless lamp in photography called shadowless lamp?

The reason for the shadow is that the object blocks the direct light, so that the back of the object is not illuminated by the light. This is the shadow.

Therefore, as long as a light source with a large enough area (or enough) is used to illuminate from different angles at the same time, so that every place in the irradiation range can be illuminated by light, no obvious shadow will be formed (but there will still be a weak penumbra, which can often be ignored).

Therefore, a large-area, multi-cap lamp group that can achieve this effect is called shadowless lamp.