I'll do my best. Safebooru is a booru, an image board where anyone can upload anime art and fan art they find, and anyone else can categorize it with browsable tags. It's like the original NSFW Danbooru, but restricted to only relatively SFW images. This creates a well-organized archive of art that I can search for niche things like floating, zero gravity, flying with balloons, flying with umbrellas, levitation, underwater settings, and such. There are APIs so people can access it with bots, and consequently, they are the primary source of training data for image generating AI.