The chipset controls communications and interactions between the CPU and other components on the motherboard.
Components on a motherboard are called embedded components.
embedded component
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Many. The questions first word "which" implies that a single component would be a correct answer but there are thousands of components and dozens of component types on a computer motherboard.
Motherboard
The component that must be compatible with every other component of the computer is the motherboard. Your computer will not function properly without them being compatible.
There are more than 3 components in a computer. An example of 3 components that every computer has: Motherboard, processor, memory.
It depends which component you are trying to replace, but almost all of the components are installed upon the motherboard, the CPU often below the heatsink (fan); the ram is in sticks and the psu is at the back, off the motherboard.
Traces
embedded
It houses the motherboard, hard drives, power supply unit and other components.
Mechanical components are components with primarily moving parts, like the fan in a computer, or gears in an industrial machine. Electronic components are ones primarily unmoving, but with complex computer parts, like the motherboard of the computer, or the logic board in the industrial machine.