This is the stuff that runs your software. Usually takes the form of a computer, a laptop, or tablet. The forms are morphing more and more. Smart phones are just specialized computer hardware.

Common parts:

CPU - The central processing unit, aka the processor. Crunches all of the numbers and calculations.

Memory - RAM Fast. Keeps track of the data being processed by the processor

Storage Getting Faster. Holds more information that Memory. Doesn't disappear when the machine is turned off.

IO Devices - Screen/Monitor, Keyboard, Mouse, Speakers, Cameras. Many of these have a special interface for translating between the core architecture (CPU, Memory) and the physical device itself.