The Socialist Party of Germany, known as SPD (Sozialdemokratische Partei Deutschlands), is one of the oldest political parties in Germany, founded in 1863. It advocates for social democracy, promoting policies that aim to achieve social justice, workers' rights, and economic equality. The party has played a significant role in German politics, particularly during the Weimar Republic and post-World War II. Throughout its history, the SPD has undergone various transformations, adapting to changing political landscapes. It has been part of several coalition governments and has contributed to key social reforms, including labor rights and welfare programs. The party continues to influence contemporary German politics and policies.