This review paper gives the introduction of the various VLSI Design techniques. Low power has emerged as an important factor in today’s world of electronics industries. The reduction of logic circuit power consumption is a major priority of a designer attempting to meet implementation requirements. Power dissipation is a matter of concern as far as designing high performance systems are concerned. This makes clock signals a great source of power dissipation. High frequency systems use a large number of clock pulses. Whereas clock signals are only used for synchronization of the circuits the power dissipation due to clock pulses is significant making it important to study and area is one of the main objectives in all VLSI circuits. Power optimization is the use of electronic design automation tools to optimize (reduce) the power consumption of a digital design.