This refers to a semiconductor chip that integrates all of the memory, logic and control circuits for an entire Central Processing Unit of a computer onto a single chip. Microprocessors come in the form of a Silicon chip mounted on an electronic circuit board. The semiconductor chip that constitutes a microprocessor consists of thousands of transistors. The transistors operate as electronic switches each having two binary states (ON or OFF). Examples of microprocessors common in today‘s market are the Intel Pentium III chip and the Intel Pentium IV chip.