The document summarizes the key internal components of a computer, including the power supply, motherboard, hard drive, computer fan, processor, RAM, video card, and DVD drive. The power supply provides electricity to power the computer. The motherboard contains the central processing unit and connections for other components like the keyboard and monitor. The hard drive stores data on a magnetic disk. The computer fan keeps the computer cool to prevent overheating. The processor acts as the computer's brain to run programs. RAM allows for random access of bytes of memory. The video card outputs images to a display. And the DVD drive reads and writes data to disks.