A funnel, in marketing terms, refers to the process that potential customers go through from first becoming aware of a product or service to making a purchase. It is often visualized as a funnel shape, where the wide top represents the initial stage of attracting a large audience, and the narrow bottom signifies the final stage of converting leads into customers. Channels are the various platforms or methods used to guide customers through this funnel. These can include social media, email marketing, and websites. Each channel plays a crucial role in engaging potential customers and moving them closer to making a decision, ultimately driving sales for a business.