API Fundamentals and Web Services

APIs power modern software by enabling different applications to communicate seamlessly with one another. This written course provides a clear, beginner-friendly introduction to Application Programming Interfaces, helping you understand their role in web development, data exchange, and system integration. Starting with core terminology, you will explore how client-server architectures operate, how HTTP requests and responses are structured, and how web services exchange data using JSON formats. What you'll learn: Understand foundational API concepts and client-server communication models; Identify HTTP request methods, headers, parameters, and status codes; Read and format structured JSON payloads for modern data exchange; Explore RESTful API conventions and OpenAPI documentation standards; Learn basic authentication methods including API keys and token-based authorization; Discover modern web integration patterns, including Webhooks. The course guides you step-by-step from foundational terms to practical integration concepts through detailed written explanations and code examples. Designed specifically for beginners, product managers, and aspiring developers, no prior API knowledge is required. Start reading today to master the fundamentals of APIs and modern web communication.