The document discusses various brand leveraging strategies such as line extensions, brand extensions, stretching brands vertically, and co-branding. It provides examples of each strategy and discusses their advantages and disadvantages. Specifically, it explains that brand leveraging uses an existing brand to expand into new product categories or classes. This provides familiarity and positive brand perceptions for consumers. Line extensions add variants to an existing brand, while brand extensions use a brand name in a different product category. Co-branding combines two brands for a joint product.