Why carbon dioxide has polar bond but it is not a polar molecule?

Carbon dioxide (CO2) has polar bonds due to the difference in electronegativity between carbon and oxygen, leading to a dipole moment. However, the molecule is linear, with the two polar bonds oriented 180 degrees apart, causing their dipole moments to cancel each other out. As a result, CO2 has no overall dipole moment, making it a nonpolar molecule despite the presence of polar bonds.