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Understand the iTunes Library
The iTunes Library is where you store all of your audio and video content, including music, podcasts, movies, and TV shows. Before you can enjoy content in iTunes, it has to be available there; you can add content from many sources. Once content is stored in your iTunes Library, you can use iTunes tools to keep that content organized so that it is easily accessible to you, and of course, do all sorts of great things with it.
Categories
The content in your Library is organized automatically by categories, including Music, Movies, TV Shows, and Podcasts. Within the Library source, you see an icon for each category. When you select a category, the content it includes is shown in the right part of the iTunes window where you browse and search it. When you find the content you want, you can listen to it, view it, create playlists, burn it to disc, and so on.