First off, it allows you to rename a large number of episodes that have been saved to your computer so that you can label them appropriately and find them much more easily.
Also, you'll have direct access to the databases of websites like TVRage, AniDB, TV.com, IMDb, and The TVDB, from which you can copy the names of all the episodes of any TV show in just seconds.
FileBot's most interesting function allows you easy access to OpenSubtitles, Subscene, Sublight, and SubtitleSource so that you can download subtitles in any language you choose.
Another function lets you check the functionality of SFV files, which are normally used to secure large archives of compressed files.
FileBot is an interesting program for anyone who watches a lot of TV shows on their computer, which, nowadays, includes the majority of us.
You must have Java installed for the program to funciton.