Data about data. Examples of metadata include descriptors indicating when information was
created, by whom and in what format. Metadata helps to organize information online and make it machine-readable. HTML is an example of metadata — it organizes the data in a web page so browsers can display it sensibly. Web pages often have hidden metadata that helps with their search engine ranks. Photos uploaded to Flickr carry metadata such as time taken, camera model and shutter speed. MP3s have metadata such as the artist name, track title, album name and so on.
