Hardware is the collection of physical parts of a Computer system that has shape and size and can be felt. The most essential hardware components are the Motherboard, CPU, RAM memory, IO system, power supply, video display controller, Bus, and hard disk drive.
Some of the normal hardware parts you see like a mouse, keyboard, monitor, and CPU are the basic components of a computer. But inside the CPU box, there is a hard disk, motherboard, and RAM, video card, CPU Fan, sound card, server components, CD/DVD drive, and many more.
The hardware components do change in shape and size as in a desktop computer the CPU integrates all the components that are connected by wires but in laptop computers, the components are integrated into a single portable unit. Basically the hardware components in a Computer system are connected through wires in order to function properly. From power supply to network connection all are connected through wires.