Distributed cloud systems represent a significant progression from conventional centralized cloud computing toward a geographically distributed computing paradigm in which multiple coordinated cloud environments operate as a single logical infrastructure. Traditional cloud platforms improved scalability and resource utilization; however, they remain constrained by regional latency, single-region dependency, and regulatory limitations. Modern enterprise applications — including financial platforms, healthcare services, IoT ecosystems, and large-scale digital marketplaces — require continuous availability, real-time responsiveness, data locality compliance, and elastic scalability across diverse user locations and device types. Distributed cloud engineering addresses these requirements by relocating computation and storage closer to end users while preserving centralized governance and orchestration. This review presents a comprehensive analysis of distributed cloud systems within enterprise environments by examining their architectural layers, design principles, and enabling technologies. The study discusses the role of microservices in decomposing monolithic applications into independently deployable components, the use of edge computing for latency reduction and localized decision-making, and the contribution of container orchestration platforms in maintaining service reliability and scalability. Additionally, software-defined networking and service mesh technologies are analyzed for their ability to enable secure, dynamic communication between geographically dispersed services. Together, these technologies form a cohesive operational framework that supports high-performance enterprise workloads. The paper further investigates operational considerations including deployment strategies, monitoring frameworks, and performance optimization techniques. Particular emphasis is placed on observability mechanisms such as distributed tracing, metrics analysis, and log aggregation, which enable administrators to monitor system health in complex multi-region environments. Security aspects are explored through zero-trust architecture, identity-based authentication, and data sovereignty compliance, highlighting the importance of integrating security throughout the system lifecycle rather than treating it as an external layer. In addition to benefits such as resilience, fault tolerance, and improved user experience, distributed cloud systems introduce new engineering challenges. These include maintaining data consistency across nodes, managing network latency variability, handling large-scale service coordination, and ensuring governance across heterogeneous infrastructure providers. The review also discusses operational overhead and skill requirements associated with designing and maintaining distributed architectures. Finally, emerging trends such as AI-driven orchestration, predictive infrastructure management, and autonomous cloud operations are examined as future directions in enterprise computing. The review concludes that distributed cloud systems will form the foundational infrastructure of next-generation digital enterprises by enabling adaptive, scalable, and reliable service delivery. This article provides a structured reference suitable for early-stage researchers and practitioners seeking to understand the design, implementation, and evolution of distributed cloud systems.