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An electronic viewfinder (EVF) is a camera viewfinder where the image captured by the lens is projected electronically onto a miniature display. The image on this display is used to assist in aiming the camera at the scene to be photographed.
Viewfinder: Viewfinder is a slot in the camera which allows you to preview the scene. The Shutter: The shutter covers the sensor (or film in case of a film SLR). The shutter opens up when the shutter-release button is pressed to allow the light to fall on the sensor/film and create a capture. The speed of the shutter can be controlled which determines how long the shutter is open and what amount of the light passes through.