Market validation is the process of presenting a concept for a new product to potential customers early in the development process to determine if there is interest in the idea and gather feedback before significant resources are invested. Some key ways to validate a product's marketability include making initial sales, conducting competitive analysis and research on existing demand, starting a crowd-funding campaign, meeting with customers directly, conducting beta testing, and gathering feedback to refine the product. This process helps reduce risk and ensure efforts are focused on developing a product with true market demand.