Photography is the art of capturing light with a camera, usually via a digital sensor or film, to create an image. With the right camera equipment, you can even photograph wavelengths of light invisible to the human eye, including UV, infrared, and radio.
Photography is also the process of recording visual images by capturing light rays on a light-sensitive recording medium (e.g. film or digital CCD). It can be thought of as two pursuits: Technical: The science of setting up the camera and the recording medium to take images in a controlled way.