With these USB OTG adapters, you can convert a USB connector to another connector such as a micro USB or USB-C connector. This way, you can connect a smartphone or tablet to a keyboard, hard drive, or USB drive. You can easily take an OTG adapter with you in a bag. For example, you can transfer your data from your smartphone to a hard drive on the train. This way, you can use your travel time wisely and have more free time left over when you get home.