1) people are photographed to zappechetit any memorable moment in their lives. So that after many years you can see.
2) it is popular to take pictures because not all people can visit this or that place. Photographed to show other people and share their impressions of what they saw.
3) The best photo in my life is a photo of the mountains. It was when I went to the sea, they sfotkali against the backdrop of the mountain. This picture I will not forget