Artificial intelligence isn't just for tech giants anymore. From healthcare to retail, businesses of all sizes are using AI to automate processes, reduce costs by 30-45%, and boost revenue by 20%. This comprehensive guide breaks down AI applications across 5 major industries with real ROI data, practical tools (starting at $50/month), and a week-by-week action plan. Learn how PayPal reduces fraud by 40%, how GE saves millions with predictive maintenance, and how Amazon drives 35% of sales through AI recommendations. Includes FAQ section, implementation challenges, and tools for every business size.