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It's a bunch of libraries for Java for making big enterprise web apps and the like.

As far as I know, it's a bunch of specifications for Java, of which there are probably a few reference implementations and for the popular specs several competing implementations (Tomcat, Jetty, Glassfish/Payara, Hibernate, EclipseLink, ...)

The specification part means that in theory one can take code written for one container runtime and move it to another that offers better $nonFunctionalRequirement (or licensing story) without code changes

curious if someone uses it, something like java server faces. I thought it died 15 years ago.

There are extremely modern parts of EE that tons of people use like JAX-RS, JPA (hibernate), microprofile, and CDI.

It's Jakarta Faces now ;) And it's still relative active with a major new version (Jakarta Faces 4) in Jakarta EE 10. Of course the entire concept of server side rendering is not as much used as it once was, but that said it's still used.

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