The document discusses brand extensions and line extensions. It defines brand extensions as applying a popular brand name to a new, unrelated product category, while line extensions refer to new sizes, styles or related products within the same category. The document then provides reasons for brand extensions, such as helping cut costs and rejuvenating the parent brand. It also discusses risks of extensions like dilution of the parent brand equity or cannibalization of the parent product. Lastly, it emphasizes that extensions require understanding consumer perceptions of the parent brand.