Often it has some integrated components like a sound card, enabling your computer to play sound, or a network card, to connect your computer to the network. Motherboard, this is the component that connects all the different parts of your computer. Memory (RAM), this is very fast memory in which temporary data is stored before being processed by the processor.
A processor (CPU), this is the heart of your computer, where the data processing is done. They always have the following components: Personal Computers, PCs for short, are computers for personal usage.