components of a digital camera

Cameras: Manual mode is an exposer mode which is the same as aperture and shutter which are semi-automatic modes but if you use manual mode you have to set aperture and shutter speed by hand.

http://www.digitalcameraworld.com/2013/08/22/manual-mode-the-real-advantage-to-making-the-switch/

Automatic mode: Automatic mode selects the best judgment for your camera. So this includes the shutter speed, aperture, focus and flash for the best picture. On auto mode it lets you override the flash or able to change to the red eye reduction.

http://digital-photography-school.com/digital-camera-modes/

Smartphone cameras:  With the Samsung Galaxy S6 it has splendid visuals and a speedy shutter.  This phone also has a 16 mega pixels (MP) rear camera which boosts the optical image stabilisation (OIS), autofocus and auto high dynamic range which improve camera shots.

http://www.techradar.com/news/phone-and-communications/mobile-phones/best-camera-phone-6-handsets-tested-904250/4

Digital single lens reflex: This is when a digital camera combines the optics and the mechanisms of a single lens reflex camera with a digital image sensor rather than photographic film.

https://en.wikipedia.org/wiki/Digital_single-lens_reflex_camera
This is a picture of how to switch the modes of the camera.