This document discusses brand extensions, including definitions of brand, line extensions, and category extensions. It outlines the advantages of brand extensions such as leveraging brand equity, reducing costs, and providing feedback benefits to the parent brand. Potential disadvantages include confusing consumers, retailer resistance if the extension fails, and diluting the parent brand image. The document provides guidelines for when extensions are appropriate and how consumers evaluate extensions, including having awareness and positive associations about the parent brand that transfer to the extension. It also lists factors that can lead to product failures such as an insufficient market or inaccurate research.