For example, if the geo-location data is saved inside the meta tags, then you some programs can show you the exact location on the world map where you captured a picture. Similarly, some of the software suites can fetch this meta information to provide you with extra tools or features.
While this information could be utterly useless for ordinary users, the professionals can use this information to optimize the pictures and enhance them. This meta information is saved inside the image file in form of meta data using various formats like EXIF, XML, IPTC and so on. When you take a picture with your digital camera, it saves the picture with some meta information like the camera model, date, location, whether flash was fired etc.
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