Final answer:
Realignment theory refers to the shift between party systems, involving a redistribution of party loyalties and a reconfiguration of the political landscape.
Step-by-step explanation:
Realignment theory refers to the shift between party systems. It is a concept in political science that describes a fundamental change in the structure and composition of political parties over time. Realignment can occur due to various factors such as demographic shifts, changing policy positions, or significant events that reshape the political landscape. It typically involves a redistribution of party loyalties and a reconfiguration of the party system.