A Motherboard or Main board is a major and the most important part of a computer it is Printed Circuit Board PCB which holds many of the crucial components of the system.Cpu, Ram, Video Card, NIC, Hard Drive, DVD Rom etc. is connected to the motherboard. A motherboard provides the electrical connections by which the other components of the system communicate. Unlike a backplane, it also connects the central processing unit and hosts other subsystems and devices.
Here is close look of a motherboard
MotherBoards are Aviable in different forms and Sizes but every board is different then other and every form has it on case for example you can fit BTX MotherBoard into a ATX case because BTX is large in size.
Form factor is great way of describing a motherboard’s size and shape, impoertan because it involves industry-wide standards and ties with the computer case and power supply unit PSU.The most common motherboard is ATX(Advanced Technology eXtended).
ATX = 305mm X 244mm
MiniATX = 284mm X 208mm
MicroATX = 244mm X 244mm
FlexATX = 229mm X 191mm
Balanced Technology eXtended
BTX = 265mm X 325mm
MicroBTX = 267mm = 263mm
PicoBTX = 267mm X 203mm
Here is close look of a ATX motherboard
Thats it i hope you have learn the basic information about motherboard.