Question

What is aperture priority mode?

Answer 1

Aperture priority mode is another semiautomatic mode. Instead of the photographer setting the shutter speed, the photographer selects the particular aperture for the photograph.

Answer 2

It's a semi-automatic mode where you pick the aperture and the camera selects a shutter speed to go with that. Shutter priority mode is the same but you pick the shutter speed and it picks the aperture.