Cross-selling recommends complementary products that enhance the customer's primary purchase. It differs from upselling (which offers a better version). Cross-sell examples: - Phone case with phone - Batteries with electronics - Protein powder with workout gear - Brushes with paint Recommendation strategies: - "Frequently bought together" - "Customers also purchased" - Bundle discounts - Personalized suggestions Implementation locations: - Product detail pages - Shopping cart - Checkout - Confirmation page - Follow-up emails