Spring BootA Java framework for production-ready apps — auto-configuration and embedded servers for microservices. 2.0 brought non-blocking Netty servers, Micrometer metrics, and HTTPHyperText Transfer Protocol — the protocol browsers use to request and receive web pages./2 defaults — the stack teams used for microservicesAn architecture splitting applications into small independent services — each deployed and scaled separately. through the late 2010s. It aligned with Spring 5's reactive programming story while keeping the `java -jar` simplicity that made Boot popular.

Spring BootA Java framework for production-ready apps — auto-configuration and embedded servers for microservices. 2.0 made reactive JavaA portable language running on the JVM — dominant in enterprise servers, Android, and big data. microservicesAn architecture splitting applications into small independent services — each deployed and scaled separately. production-viable.

WebFlux and Micrometer integrated observability and async I/O into the default Boot stack.