Whether you're working with a digital camera or a traditional film camera, the brightness or darkness of the image is dependent on exposure - the amount of light that hits the film or image-sensor array. The more light, the brighter the image. Too much light results in a washed-out, or overexposed, image; too little light, and the image is dark, or underexposed.
Most low-priced digital cameras, like point-and-shoot film cameras, don't give you much control over exposure; everything is handled automatically for you. But many midrange cameras offer a choice of automatic exposure settings, and higher-end cameras typically provide manual exposure control in addition to automatic options.
Regardless of whether you're shooting with an automatic model or one that offers manual controls, you should be aware of the different factors that affect exposure - including shutter speed, aperture, and ISO - so that you can understand the limitations and possibilities of your camera.
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