Brand extension is a marketing strategy where a company uses an established brand name on new products in different categories. This allows companies to reduce expenses and develop new products and customer bases. However, there are risks if brand extensions are inappropriate or do not have competitive advantages. Brand reinforcement strategies to maintain brand equity include advertising, promotions, and sponsorship events. Brand revitalization is used when profits decline in the mature stage, and involves increasing product usage, exploring new markets, repositioning, improving offerings, and gaining customer involvement.