In 1999, the API landscape lacked standardization, dominated by complex protocols like SOAP, which required intricate XML documents and lacked user-friendly features like HTTP response codes. Recognizing the need for a more accessible approach, Roy Fielding and his team introduced REST (Representational State Transfer) in 2000, establishing a framework based on principles such as uniform interface, statelessness, cacheability, client-server separation, and optional code on demand. REST APIs, leveraging standard HTTP methods, have since become indispensable in web and mobile applications, offering simpler integration compared to SOAP and fostering widespread adoption through their scalability and ease of use. Companies like eBay demonstrated the commercial potential of accessible APIs by using REST, which paved the way for other e-commerce giants like Amazon to follow suit, highlighting the value of APIs beyond just consumer-facing products. REST APIs, akin to Swiss Army knives, facilitate seamless communication between different software systems, although they can sometimes lead to performance bottlenecks when handling large data volumes. Nonetheless, RESTful design principles, coupled with effective management strategies like versioning and rate limiting, have enabled the creation of robust, scalable web services that drive the modern internet economy, expanding businesses' reach and simplifying life for users and developers alike.