In this case it means GPL+Classpath Exception. The link goes to the Oracle provided OpenJDK builds.
Oracle also has their own build of the JDK which is not GPL. That is free to use in commercial software as well, under their "No-Fee Terms and Conditions"
There used to be really prominent banners telling you about it. I don't see them now, but I'm also not sure they switched back. Here's an article I found explaining the switch to requiring paid usage.
The 2021 license change reverted this somewhat, by giving you one year of security fixes for free in the long term support versions (I’m sure I’m missing some detail, if not completely misinterpreting things, here)
Oracle also has their own build of the JDK which is not GPL. That is free to use in commercial software as well, under their "No-Fee Terms and Conditions"