Raspberry Pi is a piece of sensitive electronic circuit board. While not absolutely necessary, it is a good idea to keep your Pi in a case or in an enclosure. A good quality case can provide some level of protection against accidental drops, coffee spills and dust. There are cases that you can use as a base to mount your Pi either vertically or horizontally. Some cases can make a Pi aesthetically pleasing. Whatever your needs, you can find various types of Raspberry Pi cases in this area.
Different Raspberry Pi model has different layout. While some cases are compatible with different Raspberry Pi model, some are not.