The system can overheat and ruin components. It packs quite a lot of voltage. Most power supply boxes blow air outwards, but the new types for ATAs blow air into the case to help keep components cool. With all that power, you need it. Ports A port is an interface or a go between to which you can connect a device.
Computers have various types of ports.
Internally, there are several ports for connecting disk drives, video cards, and keyboards. Many are found on the Motherboard and are very basic. Externally, personal computers have ports for connecting modems, printers, mice, and other peripheral devices. These are the ones you hear about the most and need to know. They offer the most flexibility.