photography is used in many fields of science, I love photography
thats good, photography helps us to preserve history and memories thats why I like it 
Yes for personal use and business as well, and of course more direct uses like art and film making
I agree with you, photography is to the movie industry what a pen is to paper
and now people have cameras on their phones so it is used daily to record events
technology have changed so many things, I just hope that good old photography(printed photos)won't be lost as a result 100 years from now
Body worn video (police equipment)
In policing equipment, body worn video (BWV), body-worn camera (BWC), body camera or wearable camera is a wearable audio, video, or photographic recording system used to record events in which police officers or other law enforcers are involved. They are typically worn on the torso of the body on the officer's uniform. Body worn cameras for policing are often similar to other body worn video equipment used by members of the public, commercially, or by the
Photography
Photography is the art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed in many fields of science, manufacturing (e.g., photolithography), and business, as well as its more direct uses for art, film and video production, recreational purposes, hobby, and mass communication.
Typically, a lens is used to focus the light