Motherboards and Processors. An important feature of a motherboard is the socket used to house the CPU. Different types of sockets are found on various boards, with different configurations for the processor pins.
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4 PCI Express bus card slots (from top to bottom: x4, x16, x1 and x16), compared to a 32-bit conventional PCI bus card slot (very bottom).
https://en.wikipedia.org/wiki/Bus_%28computing%29
In computer architecture, a bus (related to the Latin  omnibus , meaning for all) is a communication system that transfers data between components inside a computer, or between computers.
https://en.wikipedia.org/wiki/Bus_%28computing%29
Motherboard. The amount of RAM a computer can use is dependent on the motherboard. The motherboard and connected peripherals are installed inside of a case, also known as a computer tower. A SATA cable, which can be used to connect to a motherboard.
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The internal bus, also known as internal data bus, memory bus, system bus or Front-Side-Bus, connects all the internal components of a computer, such as CPU and memory, to the motherboard.
https://en.wikipedia.org/wiki/Bus_%28computing%29
10 hilariously insightful foreign words. A motherboard is the major, underlying circuit board of a computer. The Central Processing Unit (CPU), Random Access Memory (RAM), and various disk or optical drives are all plugged into interfaces on it.
http://www.wisegeek.org/what-is-a-motherboard.htm
Computer systems generally consist of three main parts: the central processing unit (CPU) that processes data, memory that holds the programs and data to be processed, and I/O (input/output) devices as peripherals that communicate with the outside world.
https://en.wikipedia.org/wiki/Bus_%28computing%29
RAM and Different Boards. Motherboards also impact the amount and type of RAM that users can install in a computer. It is often best for someone to use a board that supports more RAM than he or she needs.
http://www.wisegeek.org/what-is-a-motherboard.htm
Purpose of Motherboards. One of the major functions of a motherboard is to act as the hub to which other computer devices connect. A board can come in many configurations to fit different needs and budgets.
http://www.wisegeek.org/what-is-a-motherboard.htm
They typically separated the computer into two worlds, the CPU and memory on one side, and the various devices on the other. A bus controller accepted data from the CPU side to be moved to the peripherals side, thus shifting the communications protocol burden from the CPU itself.
https://en.wikipedia.org/wiki/Bus_%28computing%29
what is the computer motherboard
A motherboard is the major, underlying circuit board of a computer.  In a computer, a motherboard is the major, underlying circuit board of a computer.