What are polar and non- polar molecules?

Polar molecules – the molecules in which electron distribution is not uniform between the bonded atoms are known as polar molecules. The more electronegative atom acquires a partial negative charge and a less electronegative atom acquires a partial positive charge. Example: H⁺Cl^-

Non-polar molecules- the molecules in which electron distribution is uniform between the bonded atoms are known as non- polar molecules.The electronegativity difference between two different atoms bonded together is very less in this case.Example: H₂, CH₄ etc.