The Full form of DSLR is Digital Single Lens Reflex Cameras. These DSLR’s are powerful digital cameras when it comes to extensive adjustments for professional or photography enthusiasts. DSLR’s are the combination of the parts of a single-lens reflex camera (SLR) and a digital camera back, which replaces the photographic film. Features like HD video recording with contrast detection autofocus, live preview or ergonomic integration like dedicated film speed (ISO) buttons took further advantage of the digital image sensor. In SLR or Single Lens Reflex camera, there is a single lens so we have the SL part and it was developed in the film era. The Reflex part means that the light from the lens is reflected by a mirror to illuminate a focusing screen that you view through an optical viewfinder. The key components of a DSLR camera are: Lens, Reflex mirror, Shutter, Image sensor, Matte focusing screen, Condenser Lens, Pentaprism, Eyepiece/Viewfinder. Some of the key advantages of DSLR camera over simple digital camera are: Speed, Picture Quality, Interchangeable lenses, Optical Viewfinder, Large ISO range, Easy editing, Low noise, Faster focusing, High quality in low light, Ability to use filters and Dust removal system.