In renewable technologies, ocean wave energy extraction tech is in the early development phase, especially wave power extraction technology. To extract power from waves, a generator with moving parts is used to change wave energy into mechanical energy. Now floating systems and designs that can take benefit of PE and KE are also developed. The main aim and objective of this research article are to make a complete understanding of ocean wave energy extraction technologies. This article will also tackle the potential and consumption that wave energy. This article will also explain the different energy conversion projects at different levels around the world.