How does a memory stick work?

A memory stick can hold any file. When you buy it, it will hold either 1) nothing at all or 2)software necessary to allow the memory device to communicate with your computer. There are many different kinds of 'memory sticks,' USB variety or otherwise, and they're used in a variety of electronic devices and computers. They will hold whatever kind of file you need them to hold for your electronic device or your computer. They function like a mini CD or hard drive.