The document discusses key concepts related to products including product, product line, and product mix. It defines a product as anything that can be offered to satisfy customer needs and wants. A product line is a group of related products marketed under a single brand that serve similar functions, customers, or price points. Product mix refers to the total range of product lines and items offered by a company. It examines the product mix in terms of length, width, depth, and consistency. The levels of a product from core to potential product are also outlined. Finally, Cadbury's product mix is provided as an example, with its main product lines of chocolates, biscuits, beverages, and candies.