Final answer:
An umbrella brand is used when each product line within a company has its own brand name, image, and identity.
Step-by-step explanation:
When each product line within a company has its own brand name, image, and identity, it is known as an umbrella brand. This branding strategy allows the company to create distinct identities for each product line while still connecting them under a single overarching brand.
For example, Procter & Gamble is an umbrella brand that encompasses various product lines such as Tide for laundry detergent, Pampers for baby diapers, and Gillette for shaving products. Each of these product lines has its own brand name and identity, but they all fall under the larger Procter & Gamble brand.