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Chapter 15. Annotations > What Are Annotations?
15.1. What Are Annotations?
Annotations are tags that you insert into your source code so that some tools can process them. These tools can operate at the source level, or they can process the class files into which the compiler has placed your annotations.
Annotations are widely used in Java, for example by testing tools such as JUnit 4 and enterprise technologies such as JavaEE.
