Geotagging
Alternatively called geocoding, geotagging is where a photograph's metadata is attached to a physical location. The geotag may include regional geologic data, such as city and state, or it may include more precise data such as the latitude and longitude. Geotagging data may then be read by programs to show the user where the photo was taken.
Geotagging is especially prolific online. For example, when it is used on Flickr, photos join a collection of images linked to that location. This process allows anyone to view images taken in that part of the world.
Today, there are legitimate privacy concerns regarding geotagging. Sometimes, users uploading photos to social media sites are unaware that their photos have geotagging data associated with them. Geotagged photos allows the public to know exactly where you have been or where you are now, which can then lead to concerns around cyberstalking. It could also mean a thief would know when you are away from your house.