Explanation:

Diversification is a corporate strategy to enter into a new products or product lines, new services or new markets, involving substantially different skills, technology and knowledge.
Product diversification involves addition of new products to existing products either being manufactured or being marketed. Expansion of the existing product line with related products is one such method adopted by many businesses. Adding tooth brushes to tooth paste or tooth powders or mouthwash under the same brand or under different brands aimed at different segments is one way of diversification. These are either brand extensions or product extensions to increase the volume of sales and the number of customers.