Viewfinder / evf viewfinder

The view finder is the part of the camera the photographer looks through to compose and focus their shot. The scene you can see is based on the lenses maximum wide aperture.

An EVF viewfinder is an Electronic View Finder. The camera electronically projects the scene that the lens can see onto a miniature screen. Most EVFs also display the scene based on camera settings in real time. Changes to camera settings will changes the view finder display too.