Co-branding is a marketing strategy that involves two or more brands collaborating on a product or service. Each brand contributes its own identity and reputation to create a new co-branded product. The goal is to leverage the strengths of both brands to increase sales, market share, and customer loyalty. There are four main co-branding strategies: market penetration, global brand, brand reinforcement, and brand extension. Co-branding is commonly used by retailers, restaurants, and manufacturers to gain synergies from partnering brands.