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> what is "OpenJDK"?
It is an open source project, comprising a codebase, a set of contributors, and various mailing lists, processes, and so on, just like any other open source project.
The codebase is licensed under GPL 2 [1], with a linking exception that makes it fairly similar to the LGPL [2].
The contributors are mostly employees of big companies, with Oracle having by far the largest share.
The OpenJDK project releases source code, but does not itself distribute binary builds. In this respect, it is like numerous other open source projects, such as GNU coreutils.
Binary builds are made and distributed by operating system distributors (Red Hat, Debian, FreeBSD, etc), and also by various independent groups. As usual, each distributor may or may not add its own patches before building, and may or may not contribute these upstream. Eclipse Adoptium (formerly known as AdoptOpenJDK) [1] does not apply significant proprietary patches (just branding stuff), so it's a good place to get a plain vanilla OpenJDK build. Amazon's Corretto [4] in principle could contain whatever patches Amazon thinks are cool, but in practice usually just has a few backported bugfixes [5]. Azul's Core (formerly known as Zulu) has a bunch of patches (i couldn't find a list, and an option of commercial support) [6]. Oracle have a couple of builds, but you can ignore them. There are also builds from SAP, Bellsoft, and maybe others, but i have never really looked into them. Most people i know just use the AdoptOpenJDK / Adoptium builds, or whatever their distro gives them.
[1] https://github.com/openjdk/jdk/blob/master/LICENSE
[2] https://opensource.stackexchange.com/questions/1410/what-is-...
[3] https://adoptium.net/releases.html
[4] https://aws.amazon.com/corretto/
[5] https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/p...
