The Viewfinder is the eyepiece on a camera that you hold close to your eye, to allow you to see what’s being photographed.
There are two types of viewfinders – optical, and digital.
An optical viewfinder in a DSLR works by light passing through the lens and bouncing off the reflex mirror and prism in your camera.
A digital, or electronic, viewfinder is a real time view of what the camera’s imaging sensor is seeing. Electronic viewfinders might be fitted to compact
and mirrorless cameras
, and are essentially exactly the same as what the LCD Live View screen shows.