What AI company did Apple buy?

Could you please clarify which AI company Apple acquired? I'm aware that Apple has made several strategic investments and acquisitions in the field of artificial intelligence, but without specific details, it's difficult to pinpoint a single AI company that they've bought. Could you provide me with more context or information about the acquisition you're referring to? It would be helpful to know the timeline of the acquisition, as well as any notable features or products associated with the AI company in question.