The bi-directional DC-DC converters are utilized in numerous applications based on their both directions power transfer capability. This paper aims to discuss an in-depth literature review and comparative analysis of the various kinds of the bidirectional dc-dc converter. In this paper, each converter is classified according to the characteristics, structure, and voltage boosting techniques. A broad, comprehensive study and complete assessment have been done in this paper to select the converter's suitable applications. Moreover, this study helps to optimize the topologies in the future. Furthermore, the detailed gain comparison analysis of each non-isolated converters is presented. Finally, a detailed summary of each converter is explained with the merits, demerits, power densities, features, efficiencies, and components.