The MFS International Diversification Fund Class B (MDIFX) is a mutual fund that focuses on providing investors with exposure to a diverse range of international markets. This fund is managed by MFS Investment Management and aims to achieve long-term capital growth by investing in a mix of stocks, bonds, and other securities from various countries around the world. With a ticker symbol of MDIFX, this fund is suitable for investors looking to diversify their portfolio and potentially benefit from global market opportunities.