API Lifecycle Management refers to the end-to-end process of designing, developing, deploying, testing, monitoring, maintaining, and retiring APIs throughout their lifecycle stages, from conception to decommissioning. API lifecycle management encompasses activities such as requirements gathering, API design (e.g. REST, GraphQL), implementation (e.g. coding, documentation), testing (e.g. unit testing, integration testing), deployment (e.g. staging, production), version control, release management, monitoring (e.g. metrics, logs, alerts), analytics, feedback collection, continuous improvement, and deprecation strategies. API lifecycle management practices ensure the quality, scalability, security, and reliability of APIs, aligning with business objectives and customer needs.