In past versions of the Windows operating system, installing drivers was a pretty straightforward task. Similarly, when you plug other devices into your computer, you may need to install a driver to get that device to function properly. For instance, the mouse and keyboard you are using right now each have a driver that tells the computer how to interact with the device. Drivers are chunks of code that allow one device to 'talk' to another. When working with electronics, it is not rare to encounter software drivers. You should only install drivers that you trust!
Caution: Disabling your operating system's device signature verification can put your operating system at risk.