What functionality is combined in the @SpringBootApplication annotation in Spring Boot?

The @SpringBootApplication annotation in Spring Boot combines three key annotations:

1. @SpringBootConfiguration — indicates that the class is a configuration class and contains bean definitions.
2. @EnableAutoConfiguration — enables Spring Boot's auto-configuration, which attempts to automatically configure the application based on dependencies in the classpath.
3. @ComponentScan — enables component scanning in the current package and its sub-packages, allowing automatic detection and registration of beans.

Thus, @SpringBootApplication simplifies application setup by combining these three aspects into a single annotation.