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This paper provides an introductory overview of the Spring framework and its application in building REST API-based web applications. It emphasizes the significance of Spring's architecture, including its modular layers, and highlights the advantages of using Spring Boot for simplifying configuration and deployment. The paper also discusses the flow of a typical Spring Boot application and the benefits of using Spring, such as rapid development, embedded server support, and extensive community resources. Overall, it offers valuable insights into leveraging Spring for efficient web application development.