What this is
AI visibility is whether an assistant can name you when somebody asks about the thing you sell. There is no ranked list behind it and no position to climb. A model either has you in memory, or retrieves a page about you mid-conversation, or says nothing about you at all.
Where to start
Ask the models and write down what they say. That takes a minute and it settles the argument about whether you have a problem.
The vocabulary
Answer engine optimization, LLM SEO and generative engine optimization are three names for roughly the same work. The names are still settling, so it is worth knowing which one a given article means.