Polar solvents are the solvents that contain partial positive and partial negative charge or we can say they must have a dipole moment.
The dipole moment occurs during charge separation.
Polar solvents generally dissolve other polar substances as polar solvents generally carry a positive and negative charge and when we add a polar substance negative charge of the polar substance goes to the positive charge of the solvent and the positive charge of the polar substance goes to the negative charge of polar solvents. So that Polar substances can dissolve in polar solvents.
Example of polar solvents is Water, Acetone, Methanol , etc.
Nonpolar solvents are solvents that do not have dipole moment or do not contain any partial positive and partial negative charge.
In nonpolar solvents, atoms come by forming a bond, and the atoms have less difference in electronegativities.
Nonpolar solvents do not dissolve in polar solvents as they do not carry any charge
Nonpolar solvents are dissolved in nonpolar compounds like alkanes and aromatic compounds.
Examples of nonpolar solvents are Benzene, Toluene and hexane etc.