The term "Sony APS-C" refers to a type of camera sensor size used in many of Sony's digital cameras. APS-C sensors are smaller than full-frame sensors but larger than typical compact camera sensors, allowing for a good balance between image quality and camera size. This format is popular among both amateur and professional photographers for its versatility and ability to produce high-quality images. Sony offers a range of cameras with APS-C sensors, including the Alpha series and NEX series. These cameras are known for their fast autofocus, excellent low-light performance, and compatibility with a wide variety of lenses. The APS-C format also provides a crop factor, which can be advantageous for wildlife and sports photography, as it effectively increases the focal length of lenses.