Camera is able to capture photographs and usually videos, The most important characteristics of a camera are the resolution (measured in megapixels), lens focus type (fixed or automatic), higher megapixel cameras are known to capture higher quality photos, but not always a good measurement of the photos quality.
20 MP, Carl Zeiss optics, OIS, autofocus, dual-LED flash
2160p@30fps (after WP8 Denim update), 1080p@30fps, stereo sound rec.
1.2 MP, 720p
1/1.5" sensor size, 1.12 µm pixel size, PureView technology, geo-tagging, face detection, panorama