Blockchain as a Service (BaaS) research focuses on providing blockchain infrastructure, development tools, and managed services through cloud platforms, enabling organizations to adopt blockchain without the complexity of building and maintaining the underlying systems. Studies in this domain analyze how BaaS simplifies deployment, scalability, and customization of blockchain networks for diverse applications such as finance, supply chain, IoT, healthcare, and government services. Research highlights the role of major cloud providers offering BaaS platforms that support rapid prototyping, interoperability across different blockchains, and integration with enterprise systems. Security, privacy, cost optimization, and service-level agreements (SLAs) are critical aspects explored, along with the use of containerization, microservices, and API-driven architectures to ensure flexibility. Papers also address challenges such as vendor lock-in, regulatory compliance, and performance bottlenecks. Overall, research in BaaS emphasizes delivering blockchain functionality as an on-demand, scalable, and secure cloud service that accelerates adoption in large-scale enterprises.