The computer case is a very important part of the computer. It protects all of the electronic components
inside and provides adequate ventilation to prevent overheating. The case also should be capable of
allowing you to expand your hardware if the need arises. Some cases only have 5 or 6 expansion bays.
This may not be enough if you plan to add several drives. There also should be plenty of expansion slots
on the back for adding AGP, ISA, PCI, PCIe, or other expansion cards. There are currently two basic types
of cases for two different types of motherboards. The ATX case is shown above. It is for the ATX type
motherboard and is the one most commonly used today. There is also a microATX case that is used with the
slightly smaller microATX motherboard. Before the ATX case, there was an AT case for the older AT type
motherboards. Many cases are made so that ATX, microATX, and even the older AT type motherboards will
work in them. There are also several different sizes of cases. The larger cases have more expansion bays
than the smaller cases have. The smallest case is the "desktop" type that lies flat. The next size up is
the "mini tower," then the "mid tower," then the "full tower," and finally the "server," which is the
largest. The server case is primarily used for server computers in businesses. The ATX mid tower case is
the most widely sold case for personal use.