What
can you do with it? A lot of stuff, which we’ll detail later! For
example, if you want to connect your USB drive to your phone, or maybe
use your android tablet, USB OTG can make that happen.

-USB On-The-Go, often abbreviated to USB OTG or just OTG, is a specification that allows USB devices, such as tablets or smartphones, to act as a host, allowing other USB devices, such as USB flash drives, digital cameras, mice, keyboards, to be attached to them. Use of USB OTG allows those devices to switch
back and forth between the roles of host and device. A mobile phone may
read from removable media as the host device, but present itself as a USB Mass Storage Device when connected to a host computer.