Diversification involves expanding a firm's business activities beyond its current products and markets. It allows firms to grow rapidly by entering new business fields. There are three main ways firms diversify: acquisitions, internal startups, and joint ventures. Diversification can be related, where new businesses are related to the firm's existing value chains, or unrelated where the businesses are completely different. Examples of related diversification include Johnson & Johnson expanding into different healthcare products, while General Electric and Virgin have diversified into both related and unrelated industries.