Research on Federated Cloud Computing focuses on enabling interoperability, collaboration, and resource sharing among multiple independent cloud providers to create a unified, large-scale cloud ecosystem. This area explores architectures, protocols, and management frameworks that support seamless workload migration, data exchange, and service integration across heterogeneous cloud environments. Key research directions include federated resource allocation and scheduling, trust and security management among federated clouds, and interoperability through standardized APIs and orchestration mechanisms. Other emerging topics involve policy-based federation governance, decentralized identity and access management, and blockchain-enabled trust models for cross-cloud collaboration. Additionally, integrating federated learning for privacy-preserving data analytics, optimizing cost and performance through intelligent brokering systems, and designing scalable monitoring and fault-tolerance mechanisms for federated infrastructures are significant avenues for future exploration.