Digital cameras capture images electronically rather than using film. They contain an image sensor, such as a CCD or CMOS sensor, that converts light into digital data. This data is processed by a built-in computer and stored electronically. Digital cameras allow images to be viewed, edited, printed, and shared electronically. Key factors when choosing a digital camera include resolution, zoom capabilities, memory size, battery life, compatibility with computers, and portability. Digital cameras are becoming more popular and affordable than conventional cameras due to their technological advantages.