Using the drivers only you can add the external things in your computer system. The drivers are now available in the online also so you can use to add the external things in your computer system like a printer and many more are there. Using these drivers to connect the hardware things to the computer system, have to download those drivers in your system must check the version and type of your hardware machine.
Now HP drivers are available in the online also but in the early days they are available in the CD formats which are attached to the hardware machines. Using this CD you can install the things to your computer system. But now, it is easy to download from the internet and just clicking the buttons to install on your computer system and to enjoy the hardware to your PCs, and moreover to concentrate on the correct hardware number and model.