The JavaDoc says a bit about it.
Annotations denoting the roles of types or methods in the overall architecture (at a conceptual, rather than implementation, level).
The noun definition of
sterotype from Merriam-Webster says this:something conforming to a fixed or general pattern; especially : a standardized mental picture that is held in common by members of a group and that represents an oversimplified opinion, prejudiced attitude, or uncritical judgment
It seems that it is for suggesting a role of particular class that is being annotated. This seems to make sense because it is often recommended that you annotate your Controller classes with
@Controller, Service classes with @Service, and so on.
In general, Spring suggests that they make nice point-cut demarcations for your AOP needs. (besides the obvious component-scanning functionality)
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