Polarity is a term used in electricity, magnetism, and electronic signaling. Suppose there is a constant voltage , also called an electric potential or electromotive force (EMF), between two objects or points. In such a situation, one of the objects or points (poles) has more electrons than the other. The pole with relatively more electrons is said to have negative polarity; the other is assigned positive polarity. If the two poles are connected by a conductive path such as a wire, electron s flow from the negative pole toward the positive pole. This flow of charge carriers constitutes an electric current . In physics, the theoretical direction of current flow is considered to be from positive to negative by convention, opposite to the flow of electrons.

The property of having poles or being polar "it exhibits polarity when presented to a magnetic needle".
the relative orientation of poles; the direction of amagnetic or electric field.
the state of having two opposite or contradictorytendencies, opinions, or aspects.

When two atoms combine to form a compound then the atom with more electronegativity attract the shared pair of electrons towards itself which lead to the existence of poles. this tendency is called polarity