A "API (Application Programming Interface)" is a set of rules for interacting with a specific application or system and can be used to achieve cross-platform functionality. The application can then be tested for different platforms using a "IDE (Integrated Development Environment)", which is a suite of software with a variety of integrated development tools.
APIs define how different software components should interact with each other, allowing developers to create applications that work across different platforms and operating systems. IDEs, on the other hand, provide a comprehensive set of tools for writing, debugging, and testing code, making it easier for developers to create software that is reliable and efficient. Together, APIs and IDEs are essential components of the software development process, helping to ensure that applications are built to the highest standards and can be deployed on a variety of platforms.