Polar ANYTHING dissolves in water (as long as it's soluable)!
Water is polar! And Polar solvents dissolve polar (or ionic) solutes!
That's why salt dissolves in water and oil doesn't. (Oil is nonpolar.)
This is true the other way as well.
Nonpolar solutes can dissolve in nonpolar solvents.
That's why oil dissolves in benzene (C6H6) and salt doesn't!