iTunes keeps track of songs by creating a virtual library, allowing users to access and edit a song's attributes. These attributes, known as metadata, are stored in two separate library files. The first is a binary file called iTunes Library and it uses a proprietary file format ("ITL"). It caches information like artist and genre from the audio format's tag capabilities (the ID3 tag, for example) and stores iTunes-specific information like play count and rating. iTunes typically reads library data only from this file.

iTunes lets you enjoy all your music, movies, video, and TV shows on your Mac or PC. When you want to watch or listen to something, you no longer have to look through your CDs or flip through channels — just go to your computer and open iTunes. With your entire media collection in your iTunes library, you can browse everything faster, organize it all more easily, and play anything whenever the mood strikes.

However, Mac users always meets a problem about how to import DVD to iTunes for transferring DVD movies to iPad, iPod, iPhone, etc.

Q: How to get a dvd from your computer desktop to iTunes or onto an iPod Touch(mac)?

Hey i got a new iPod touch for christmas and also some movies and i wanted to put the movies on my touch. It wont go into itunes just by dragging and i'm sure that there is something you can do without having to get a file converter. I tried a file converter but it left me witha waterstain for the whole movie. If anyone can help that'd be great btw ive got a mac.

Luckily, a friend of mine recommended me a DVD to iTunes Converter for Mac which he tried very great. I download the free trial and found it's very easy to use, and can rip DVD to iTunes video and audio compatible formats-MP4, MOV, M4V and audio formats MP3, M4A, WAV, AIFF for Mac OS. Then I bought it without any hesitating. If you have the same problem with me, maybe you can try it. Learn the details about how to import DVD to iMovie! Hope to help you.