Collection of data or a library. The Meta prefix means an underlying definition or description. Examples of data collected include things like author, date, file size etc. For media software such as XBMC the metadata crawled and copied onto PC or HTPC includes DVD images, cast information, plot details, reviews and fanart. This gives users the ability to filter the metadata to find specific information such as, all movies starring Clint Eastwood or all movies directed by Steven Spielberg.