Canon APS-C refers to a specific sensor size used in many of Canon's digital cameras. The APS-C format measures approximately 22.2 x 14.8 mm, which is smaller than a full-frame sensor. This size allows for a crop factor of about 1.6x, meaning that lenses appear to have a longer focal length compared to their full-frame equivalents. Cameras with Canon APS-C sensors are popular among both amateur and professional photographers due to their balance of image quality, size, and cost. They are often lighter and more compact than full-frame models, making them ideal for travel and everyday photography.