The term API versioning refers to the practice of managing changes and updates to an Application Programming Interface over time. It allows developers to introduce new features, improvements, or fixes while ensuring that existing client applications using the API remain functional. Versioning can involve modifying the API's URL or request headers to indicate which version is being accessed. This careful management safeguards against disruptions caused by changes, providing flexibility for both API providers and users. Effective API versioning is crucial for maintaining compatibility and fostering innovation.