Some Android devices support a very useful feature USB On the go, micro USB OTG adapter, or OTG. It means that you can use your Android device as a USB host and connect, for example, a USB stick directly to the smartphone.The applications of USB OTG are varied and based on compatible hardware. With smartphones and tablets, the technology can be used to connect keyboards, mice, hard drives, and USB sticks. However, not all smartphones and tablets are OTG compatible. If you’re not sure whether your device has the capability of acting as an OTG host, you can easily figure it out by downloading a free app from the Play Store called USB Host Diagnostics. Hope it help :-)
