A motherboard is a Printed Circuit Board (PCB) that connects your processor, memory and all your expansion cards together to assemble a PC. Most motherboards made nowadays are ATX. An ATX motherboard has the standard I/O (Input/Output) connectors such as PS/2 ports, parallel ports, serial ports, etc, built onto the motherboard. Old AT motherboard on the other hand uses I/O cards and cables which needs to be plugged into the motherboard, which gets a bit untidy. AT motherboard requires AT keyboard and AT power supply. ATX motherboard fits into an ATX case and comes with an ATX power supply. The following is a pictures of an ATX motherboard.
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