Diversification is a corporate strategy where a firm enters new markets or industries that are not currently part of its business by developing new products for those markets. Firms diversify for reasons such as having excess resources, diminishing growth in their current industry, cost savings opportunities, or spreading business risks. There are two main types of diversification: related diversification, where a firm leverages its technical expertise across industries, and unrelated diversification, where a firm enters industries with no strategic fit. Firms must evaluate the attractiveness and costs of new industries as well as whether diversification creates shareholder value.