This document discusses brand extension, which is using an existing brand name to promote a new product in a different category. The key difference between a line extension and a brand extension is that a line extension keeps the product category constant, while a brand extension varies the product category. Some advantages of brand extensions include leveraging existing brand equity, increasing awareness of the brand name, boosting profits through multiple product categories, and reducing costs compared to new brand launches. However, brand extensions also carry risks such as damaging the parent brand image if the extension fails or cannibalizing sales of the original product. Appropriate conditions for brand extensions include having strong prior brand equity and a perceived connection between the extension and parent brand.