Middleware is a critical component in modern software architecture, functioning as an intermediary layer between operating systems and applications to manage processing related to application services and API management. Originating from the 1968 NATO Software Engineering Conference, middleware became widespread with the rise of distributed systems in the 1990s. Its advantages include advanced processing, reduced development costs, and compatibility across diverse operating systems and hardware. In web applications, middleware is organized into three types—web server, application server, and database middleware—each managing different layers of presentation, logic, and data. Middleware enhances application development by providing DevOps enablement, execution environment provisioning, connectivity, and process automation, while also playing a crucial role in system operations by ensuring backup, efficiency, monitoring, and redundancy for system reliability. Tools like CircleCI exemplify middleware’s role in automating building, testing, and deployment processes, thereby enhancing cloud-native development capabilities.