The art of taking photos is called photography. I like taking photos. It leaves a great number of memories of somewhere or somebody. But from my point of view, the best way to remember a picture or person is to put it in my heart, not on cellphones.
Actually, I recently found out that there's another way to use photos. Scientists take photos to study it. For example, space telescopes took photos of stars which was far away from the earth. Also, when two runners reached the finish line in about the same time, high-speed photography could show who really won. Some old photos can show us what the live in the past was like. Moreover, some old photos could show us what the life in the past was like.
Photography really helped us a lot, it can help us remember or learn a multitude of things. We have to be thankful to the first person who created the camera.