API integration is the process of connecting different software applications to allow them to communicate and share data. An API, or Application Programming Interface, acts as a bridge that enables one program to request and exchange information with another. This integration helps streamline workflows and enhances functionality by allowing different systems to work together seamlessly. For example, a mobile app might use an API to access data from a cloud service, enabling users to retrieve their information without needing to log into multiple platforms. This not only improves user experience but also saves time and reduces errors in data handling.