Live chat for marketing is a contextual method that allows potential customers to interact with companies in real-time, at the exact moment they're thinking about purchasing a product or service. By using live chat, businesses can drive more sales, reduce the time it takes to convince prospects to purchase, and improve their overall customer experience. Key best practices include targeting high-intent pages, lead with a question, set achievable goals, monitor, test, and improve chats, rely on chatbots but be transparent about it, and segment users based on their behavior and preferences. Companies that have successfully implemented live chat for marketing include Expensify, Copper, Tradeshift, Unity, and Droplr, which have seen significant improvements in sales revenue, lead generation, customer retention, and overall business growth.