Final answer:
A monitor is an I/O peripheral device that displays visual information through pixels, while a hard drive pertains to storage of digital data.
Step-by-step explanation:
A monitor is a peripheral device for an I/O (Input/Output) system. It serves as an output device that displays visual information to the user. When you look at the closeup of a flat screen monitor, you can see the many individual pixels which can be red, green, and blue in color, contributing to the wide array of colors you see on the screen.
In contrast, a computer hard drive is associated with storage, and it is where digital data is saved. The two components serve different functions within a computer system but are both integral to its operation.