Is there a way to communicate with USB devices on Android?

I have a really short question: Is it possible to communicate/use USB devices on Android OS? I assume it might be tablet device.

Lest say i want to connect some sort of USB card scanner to android tablet. Will it work? Do i need to write drivers by myself?

Thanks.

How do I control USB settings on Android?

To change USB preferencesConnect a USB cable to your device. Drag down the status bar, and then tap Android System next to (USB icon). Tap Tap for more options, and then select an option.

First, you need a USB host port on your tablet. Except for On-the-Go (which is a special design that can be either host or device), it is not possible to connect two USB devices together. The incompatibility is electrical, no amount of software changes can make it work.