Global stock funds can invest in the U.S. as well as overseas. Mortgage funds own mortgage-backed securities, such as Ginnie Maes or collateralized mortgage obligations. Global Bond funds can hold either U.S. or foreign bonds. Muni funds emphasize credit safety by investing in mostly BBB-rated or better municipal bonds. Yld muni funds seek higher yields by owning mostly lower-rated or unrated 'junk' muni bonds.
Style describes U.S. stock funds by the kinds of companies they invest in most heavily.
A decile rank of 5 or 6 is average. Use the decile ranks rather than total returns to gauge consistency year to year. You will rarely find a fund ranked 1 across the row, but most good funds have at least three years out of five of above-average results. Down Market shows performance during the last down market for each category of funds. This atypical bear market indicates primarily the percentage a fund was invested in tech stocks.