Motherboard

A motherboard is one of the most important parts of a computer system. It is set through the screw on the casing. This is the main printed circuit board in general-purpose computers and other expandable systems. It connects all peripheral components of computer system such as: CPU (Processor), SMPS, Hard Disk, RAM, Modem, LAN Card, CD-ROM, Floppy Drive etc.

For example, look at the motherboard in below picture.