Here's a breakdown:

* Electronegativity is a measure of an atom's ability to attract electrons towards itself when it forms a chemical bond.

* Shared electrons are the electrons that are involved in a covalent bond between two atoms.

The more electronegative atom will pull the shared electrons closer to its nucleus, creating a partial negative charge on that atom and a partial positive charge on the less electronegative atom. This difference in charge distribution within the molecule is called a dipole moment.

Example:

In a water molecule (H₂O), oxygen is more electronegative than hydrogen. This means the shared electrons in the O-H bonds spend more time closer to the oxygen atom. This results in a partial negative charge on the oxygen atom and a partial positive charge on each hydrogen atom.