A "funnel" is a tool used to channel liquids or fine-grained substances into a container with a small opening. It typically has a wide top and a narrow bottom, allowing for easy pouring without spills. Funnels are commonly made from materials like plastic, metal, or glass and are used in various settings, including kitchens and laboratories. In addition to physical funnels, the term can also refer to a marketing concept known as a "sales funnel." This model illustrates the customer journey from awareness to purchase, helping businesses understand how to attract and convert potential customers.