The Western Asset Core Bond Fund Class IS (WACSX) is a mutual fund that primarily invests in a diverse portfolio of high-quality fixed income securities, such as government and corporate bonds. It aims to provide investors with a stable stream of income and potential for capital appreciation over the long term. The fund is managed by Western Asset Management Company, a leading global investment firm with a strong track record in fixed income investing. With its focus on core bond investments, WACSX may be suitable for investors seeking a conservative and balanced approach to their portfolio.