What is API design and development?

API (Application Programming Interface) design and development involves creating and building interfaces that allow different software systems to communicate and exchange data with each other. API design focuses on defining clear and consistent specifications for how an API functions, including its endpoints, request methods, data formats, and authentication mechanisms. API development then implements these specifications, writing the code that handles requests, processes data, and returns responses. APIs are commonly used to integrate applications, provide access to data and services, and enable the creation of new applications by leveraging existing functionality.