Delegated Proof of Stake (DPoS) has emerged as a widely studied blockchain consensus mechanism aimed at enhancing scalability, energy efficiency, and transaction throughput compared to traditional Proof of Work (PoW) and Proof of Stake (PoS) models. Research papers in DPoS blockchain consensus primarily focus on its voting-based delegation process, where stakeholders elect a limited number of trusted delegates (or witnesses) to validate transactions and produce blocks, thereby reducing latency and improving performance. Studies investigate critical aspects such as security against collusion attacks, decentralization trade-offs, governance models, incentive mechanisms, and fairness in delegate selection. Recent works also explore improvements in Byzantine fault tolerance, reputation systems, and hybrid approaches combining DPoS with other consensus mechanisms to address vulnerabilities like vote buying, centralization risks, and sybil attacks. Furthermore, DPoS research is being extended into domains such as Internet of Things (IoT), supply chain management, and digital identity, showcasing its potential for real-world large-scale applications where efficiency, low energy consumption, and rapid consensus are essential.