Microservices and APIs are distinct yet complementary technologies often used together to build scalable and resilient applications. An API (Application Programming Interface) is a set of rules and protocols enabling software to interact, whether for retrieving data or accessing hardware features, and can be public or private. HTTP APIs commonly employ REST or GraphQL protocols to facilitate efficient client-server communication. Microservices, on the other hand, are independent units of functionality that can be developed, deployed, and scaled independently, offering greater flexibility and efficiency compared to monolithic architectures. They promote service independence, effective data processing, and resilience, allowing for easier scaling, updating, and problem isolation. Together, microservices and APIs form the foundation of a composable architecture, enabling modularity and reuse, and allowing development teams to leverage third-party services for expanded functionality and reduced infrastructure costs. Contentful exemplifies this approach by offering a platform for content management and delivery through its REST and GraphQL APIs, enhancing scalability and facilitating efficient content management across various channels.