Define polar and Non-polar molecules. Give example

Polar Molecule:- A molecule in which the individual dipoles do not cancel each other and results in a net dipole moment is called a polar molecule.

Example:-$H_{2}O$, It has a slight positive charge on one side and slight negative charge on the other side.

Non-Polar Molecule:- A molecule in which the individual dipoles cancel each other & result in zero net dipole moment is called a non-polar molecule.

Example:-$H_2$, it has a net zero dipole moment.