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DSLR stands for Digital Single Lens Reflex, which basically means that light travels through a single lens and a mirror is used to reflect some of that light through the view finder, which shows the user exactly what the image will be. Unlike most point and shoot cameras, DSLR's are built to be adaptable. There are a myriad of different lenses, flashes and filters to suit any zoom requirement or light condition. Most point and shoot cameras rely on digital zoom which is nowhere near the quality of a DSLR's optical zoom, due to the lens size.
DSLR's tend to have larger image sensors which allows for larger pixel sizes. More pixels results in photos that are less grainy, especially when blown up. Although there are differences in quality of DSLR lenses, in general a DSLR lens is better than the lenses found on fixed lens digital cameras. The large amount of glass in the bigger DSLR lens improves the quality of the lens.DSLR cameras have a higher range of ISO which allows you to shoot in a variety of different light conditions. ISO is the level of sensitivity of a camera to available light, the higher the ISO the higher the camera's sensitivity to light is and vice versa.
If you want a great camera that will allow you to take pictures like a professional, you need a DSLR camera!