The motherboard is the computer"s main circuit board. It"s a thin plate that holds the CPU, memory, connectors for the hard drive and optical drives, expansion cards to control the video and audio, and connections to your computer"s ports (such as USB ports).

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The central processing unit (CPU), also called a processor, is located inside the computer case on the motherboard. It is sometimes called the brain of the computer, and its job is to carry out commands. Whenever you press a key, click the mouse, or start an application, you"re sending instructions to the CPU.
RAM is your system"s short-term memory. Whenever your computer performs calculations, it temporarily stores the data in the RAM until it is needed.
The hard drive is where your software, documents, and other files are stored. The hard drive is long-term storage, which means the data is still saved even if you turn the computer off or unplug it.
The power supply unit in a computer converts the power from the wall outlet to the type of power needed by the computer. It sends power through cables to the motherboard and other components.
Most computers have expansion slots on the motherboard that allow you to add various types of expansion cards. These are sometimes called PCI (peripheral component interconnect) cards. You may never need to add any PCI cards because most motherboards have built-in video, sound, network, and other capabilities.
The video card is responsible for what you see on the monitor. Most computers have a GPU (graphics processing unit) built into the motherboard instead of having a separate video card.
The sound card—also called an audio card—is responsible for what you hear in the speakers or headphones. Most motherboards have integrated sound, but you can upgrade to a dedicated sound card for higher-quality sound.

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Bluetooth is a technology for wireless communication over short distances. It"s often used in computers to communicate with wireless keyboards, mice, and printers. It"s commonly built into the motherboard or included in a wireless network card. For computers that don"t have Bluetooth, you can purchase a USB adapter, often called a dongle.
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