USB On-The-Go (OTG) is a standardized specification for USB connections that allows a device to read data from a USB connection without requiring a PC. The device is basically becoming a “USB Host”, which isn’t an ability every gadget has.
For example, you can connect Flash Drives and External Hard Drives for external storage, then transfer video files, for example, and then play them with player.
You can also Play With Video Game Controllers on your tablet, control Android With Keyboards and Mice.
Moovygo supports OTG as long as your connected device is OTG-enabled.