Define a Spring Boot starter?

A Spring Boot starter is a curated dependency descriptor - just a Maven or Gradle artifact with no code of its own - that pulls in a coherent set of libraries known to work well together for a particular purpose, so you don't have to hand-pick and version-match each one yourself.

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Adding spring-boot-starter-web, for example, brings in Spring MVC, an embedded Tomcat server, and Jackson for JSON, all at compatible versions. Starters exist for data access (spring-boot-starter-data-jpa), security, testing, and dozens of other concerns, and each one usually triggers related auto-configuration once it's on the classpath.

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