Answer:

The Camera Lens: The purpose of the camera lens is to focus and direct the incoming light. The camera lens consists of one or more precisely shaped pieces of glass or plastic called elements. The light coming through the elements is "bent" or directed to the image sensor where the information about the light is captured

The Camera Shutter: As previously mentioned, light enters the camera through the lens. However, the light coming through the lens cannot reach the image sensor until the shutter release button is pressed and the camera shutter is opened.

Camera Image Sensors and Pixels: The focused light coming through the lens is directed to the digital camera's image sensor. That focused light is "captured" or read by the sensor prior to being stored in the cameras memory card. The image sensor has a grid with millions of microscopic light information gathering elements called "photosites."

Screens: Just about all cameras manufactured these days have LCD (Liquid Crystal Display) screens. The LCD screen is the part of the camera that allows you to view your subject or scene before taking ​the picture. The LCD screen also allows you to see your images immediately after you take a picture.

Eye Level Optical Viewfinders: All Digital Slr cameras are equipped with eye level viewfinders and most of them also have LCD screens. Many Compact System cameras and Bridge cameras are also equipped with eye level viewfinders.