Spring Boot is an open SOURCE Java-based spring framework, which ease to develop a stand-alone and production ready micro service-based applications:

• Spring boot is a combination of spring framework, embedded HTTP servers and configuration annotation

• It follows “Opinionated Defaults Configuration” Approach to avoid lot of boilerplate code and configuration to improve Development, Unit Test and Integration Test Process.
• Spring boot reduce Development, Unit Test and Integration Test time and to ease the development of Production ready web applications.
• Spring boot comes with auto configuration, for instance, we must mention the dependency it will configure the spring boot accordingly, just we need to add the @EnableAutoConfiguration annotation
• Spring boot support both Java and Groovy. 
• Spring boot also support Spring Initializer to GENERATE the base project.
• @SPRINGBOOTAPPLICATION annotation requires to configure the spring boot application.
• Spring boot embedded HTTP server generally run on 8081 server port.

Spring boot ease and simplify the development of rest FULL web service and provide a quicker development technique by USING the key features provided by spring boot framework.