The Arduino Software (IDE) can be extended through the use of Libraries, just like most programming platforms, to provide extra functionality to your sketches. These tutorials walk your through the Examples of a number of libraries that come installed with the IDE, to open them click on the toolbar menu: File > Examples.
To see the complete list of Libraries for Arduino boards (including Arduino Due, Arduino Zero and common contributed Libraries) visit the Library Reference page.
Download the latest Arduino Software, certain fuctions may not work in earlier versions.