Direct answer
AI business automation uses AI models to make decisions inside a workflow, not just execute fixed steps. Traditional automation runs if-this-then-that rules; AI automation reads context, judges ambiguous cases, and picks the next action itself. That's the practical line between a Zapier trigger and an agent that drafts and sends a reply.
What actually separates AI automation from regular automation?
A Zapier workflow moves a lead from your form into HubSpot the instant it arrives. It doesn't decide whether that lead deserves a personal reply or a form rejection. That's the gap AI business automation is built to close, and it's a narrower gap than most vendor pages make it sound.
Traditional automation runs on rules you wrote in advance: if field X equals Y, do Z. AI automation runs on a model that reads the actual content, the way a person skims an email, and picks a response even when the input doesn't match anything you anticipated. The rules didn't change. The judgment did.