Application Programming Interface (API) is a set of protocols, routines, and tools that governs how software components should interact, creating a bridge between disparate software systems. Coursera's API catalogue provides you with a comprehensive understanding of how to design, implement, and maintain APIs. You'll learn about various types of APIs like REST, SOAP, and GraphQL, along with API testing, documentation, and best practices for security. You'll gain hands-on experience in integrating APIs in web, mobile, and cloud applications and understand their role in facilitating seamless connectivity in the digital world. Mastering API skills will position you as a valuable asset in any software, web development, or cloud computing team.