Connect Your Smartphone with Printer,Keyboard,Mouse, Gamepad, etc,.

Unique Way to use your smartphone:

Thanks to USB OTG, you can expand your Android smartphone’s functionality in numerous ways, and use it to do extremely cool things . Some us know it but most of us have used OTG to connect to Flash drive only.

Use Mice and Keyboards with Android Phone

Tired of typing in that small screen of smartphone just connecting keyboard to your smartphone makes it so simple.

I have typed C programs,text documents,played games and done many interesting stuff with smartphone.

Gaming Controller

If you cannot buy PS3 or PS4 no problem just connect the controller through OTG and play awesome games. Play Asphalt8 , Real Racing, Modern Combat and Dead trigger etc.()

Other things to OTG can be connected to are

Ethernet

Printer

Create Music on Android with MIDI Controller Apps Using Musical Instruments

USB accessories like LED light , Fan , Selfie Stick ,Microphones.

Make the best use of your smartphone connect to USB hub and discover the endless possibilities.

Edit 1:Transfer charge from one device to another.(mentioned by Anand Kumar)

All you have to do is connect the two phones, and the phone acting as the USB host (the one directly connected to the USB OTG cable) will start charging the other device.