The MassMutual Select T. Rowe Price Retirement 2050 Fund Class M4 (MMDGX) is a mutual fund that focuses on long-term growth and retirement planning. It is managed by T. Rowe Price, a reputable investment management firm, and is designed for investors who plan to retire in the year 2050. This fund offers a diversified portfolio of stocks and bonds, with a mix of domestic and international investments. It also has a moderate risk level, making it suitable for investors with a medium risk tolerance. Overall, the MMDGX fund aims to provide investors with a steady and reliable source of income for their retirement years.