Know what a polar molecule is and why water is a polar molecule

Water is a polar molecule and also acts as a polar solvent. When a chemical species is said to be "polar," this means that the positive and negative electrical charges are unevenly distributed. The positive charge comes from the atomic nucleus, while the electrons supply the negative charge.

because there is an irregular distribution of electronic density in it. For this reason, water has a partial negative charge near the oxygen atom and a positive partial charge near the hydrogen atoms.