Nowadays every photo taken with a mobile phone or digital camera contains metadata. This metadata, called Exif data, contains information about your camera, like brand and model name, the dimensions of the image and - when available - also GPS coordinates which reveal the location where the picture was taken.
File NameExample Saalbach.JPG
Creation Date2013-01-01 14:10:17
File Size289,505 bytes (282.7 KB)
Dimensions1024 x 768 pixels