The Home Sharing feature in iTunes makes it possible to stream an iTunes library directly from a computer to an iPhone, iPad or iPod touch. As long as the iOS device is connected to the same Wi-Fi network as the computer, large iTunes collections can be accessed directly from iOS, without syncing or taking up storage space. It only takes a few steps to set up Home Sharing and start streaming music and video.
First, open iTunes on the computer and navigate to File -> Home Sharing -> Turn on Home Sharing. Older versions of iTunes (10.2 to 10.7) have the Turn on Home Sharing option under the Advanced menu. Enter your Apple ID and password to start sharing the iTunes library. iTunes media on multiple computers can be shared over the same Wi-Fi network.