It's hard to say as "Docker" as a term or product name has diluted pretty much as they variously use it for various products with various functionalitites, and

It's hard to say as "Docker" as a term or product name has diluted pretty much as they variously use it for various products with various functionalitites, and they don't have anything just called "Docker" any more. There's a lot of virtualization stuff for various operating systems, orchestration stuff, etc. (Note that the article also doesn't to link to any specific product, just to the Docker company front page. For me the first link the front page offers is "Docker Desktop for Linux" which is I guess a virtualization based system)