Here's a breakdown:

* Electronegativity is a measure of an atom's tendency to attract a shared pair of electrons in a covalent bond.

* The higher the electronegativity of an atom, the more strongly it attracts electrons.

* This difference in electronegativity between two atoms in a bond leads to a polar covalent bond, where the electrons are unevenly shared, creating a partial positive charge on one atom and a partial negative charge on the other.

Let me know if you'd like more detail on electronegativity or polar covalent bonds!