Amid growing concern about global warming, renewable energy sources are considered more important now. Energy is extracted from many renewable sources. Among this all, the ocean wave is one of the largest sources. Harvesting energy from this source has been one of the interesting and great challenges to researchers for many years. There are plenty of methods accepted to harvest electrical energy from sea waves. However, in reality, technical and economical intricacies are issues in harvesting energy from the ocean. Effective use and sustainability of wave energy converters (WECs) depend on competence in dealing with circumstances in maximum energy extraction, their configuration in the rough seasonal waves and addressing economic issues. This article gives a complete overview of WECs in comparison with all other ocean energy converters. It will help researchers to speed up their ongoing research on developing ocean WECs. The aim of this evaluation was to serve the information and describe the significance of ocean WECs. Another objective was to broaden the search of results gained in other fields in the WEC and to stimulate research on topics that have not been in the focus so far.