The Christian Social Union (CSU) is a political party in Germany, primarily active in the state of Bavaria. Founded in 1945, it is a sister party to the Christian Democratic Union (CDU) and shares similar conservative values. The CSU focuses on issues such as family, social justice, and economic stability, aiming to represent the interests of Bavarian citizens. The CSU is known for its strong regional identity and has been a dominant force in Bavarian politics for decades. It often collaborates with the CDU at the federal level, particularly during elections, to form a united front for conservative policies across Germany.