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OTG means On the go. The most common one we use is when we use a PC, which acts as a host, and connect a USB flash drive or a smartphone to it. With the introduction of more devices being OTG compatible, you can now bypass the PC: photos can be sent directly from your camera to a printer, a keyboard can be connected directly to a mobile device, or a USB stick can be connected to a smartphone. One of the easiest ways to figure out whether you have a device that is USB OTG compatible is to look for the following USB logo with green arrow.
An OTG cable is an “On The Go” cable. It has different size USB connectors on the end, so that you can connect a variety of devices with different USB connectors. Generally they are male micro-USB to USB, but sometime they include other connectors. OTGs are useful because the size of the USB port on tablets and smartphones isn’t the same as those on most laptops and desktops, making it harder to use standard cables to connect the them.