A computer system is made up of several important tools and components that work together. The system unit is the main case that houses the motherboard, which connects the CPU, RAM, storage, and other parts, while the power supply provides the electricity needed to run them. For input, a microphone allows sound to be captured, while for output, a monitor displays images and text, and speakers produce sound. Data can be stored or shared using CDs and DVDs, which are optical discs, though less common today. To connect to the internet, a modem is used, translating digital signals into a form that can travel over communication lines. Altogether, these tools make it possible for computers to process, store, display, and share information effectively.