Now a days smartphones comes with a feature called geo-tagging. For what purpose it is used?

To insert geographical information into a photo, associating it with the location it was taken at.

To add a keyword into a photo so that whenever you search for the photo, you can look up for it by using the keyword.

To add a 3D perspective to a photo, so that as soon as you tap on the photo it starts playing a video.

To add color filters to all those photos that were taken at a particular location.