Spring Boot is an open-source Java framework that simplifies the development of Spring-based applications, particularly web applications and microservices, by providing a streamlined and opinionated approach to configuration and dependency management. Open-source framework: Spring Boot is an open-source framework developed by the Spring team. Built on top of Spring Framework: It is an extension of the Spring Framework, inheriting its features and benefits. Simplifies development: Spring Boot streamlines and simplifies the development process by providing a pre-configured platform with minimal configuration. Focus on business logic: It allows developers to focus on writing business logic rather than spending time on configuring infrastructure and dependencies. "Opinionated" approach: Spring Boot takes an "opinionated" view of the Spring platform and third-party libraries, providing sensible defaults that developers can customize as needed. Stand-alone applications: It makes it easy to create stand-alone, production-grade Spring-based applications that can be run with a single command. Embedded servers: Spring Boot supports embedded servers like Tomcat and Jetty, eliminating the need for external server deployments.