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Everything You Need to Know About Computer Hardware   Computer hardware refers to the  physical  components that make up a computer system. There are many different kinds of hardware that can be installed inside, and connected to the outside, of a computer. Computer hardware may sometimes be seen abbreviated as  computer hw . List of Computer Hardware Here are some common individual computer hardware components that you'll often find  inside  a modern computer. These parts are almost always found inside the  computer case, so you won't see them unless you open the computer: Motherboard Central Processing Unit (CPU) Random Access Memory (RAM) Power Supply Unit (PSU) Video card Hard Disk Drive (HDD) Solid-State Drive (SSD) Optical disk drive (e.g., BD/DVD/CD drive) Card reader (SD/SDHC, CF, etc.) Common hardware that you might find connected to the  outside  of a computer, although many tablets, laptops, ...