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, f/2.4, 26 mm, Carl Zeiss optics, OIS, autofocus
2160p@30fps (after WP8 Denim update), 1080p@30fps, stereo sound rec
1/2.5" sensor size, 1.12 µm pixel size, PureView technology, geo-tagging, face detection, panorama
Flash Light => There is commonly two types of flash lights are used in camera mobile phones, LED Flash (LED flash offers lower power consumption with drive circuitry that takes up very little room, LEDs can be strobed faster than any other light source), Xenon Flash (xenon flash produces an extremely intense full-spectrum white light for a very short duration)
Dual-LED (dual tone) flash
1.2 MP, f/2.4, 720p@30fps