Clustered systems and distributed systems are both forms of computing, but they differ significantly in structure and application. A cluster is a specific type of distributed system characterized by tightly coupled computers that are typically located close to each other and connected through high-speed networks. Clusters are often used for high-performance computing tasks, such as those found in supercomputers, which can consist of multiple CPUs working together in a single location. For instance, the fastest supercomputer, a Cray-built cluster at Oak Ridge National Labs, exemplifies this setup.In contrast, distributed systems can operate across various locations and do not necessarily require the high speed associated with clusters. They can handle less compute-intensive tasks, such as a point of sale system at a restaurant uploading data to a central database while other systems across the country perform similar functions simultaneously. This flexibility allows distributed systems to be utilized in a wide range of applications beyond just high-performance computing.