The PSOE (Partido Socialista Obrero Español) is a major political party in Spain, founded in 1879. It is a center-left party that advocates for social democracy and progressive policies. The PSOE has played a significant role in Spanish politics, particularly after the end of the Franco dictatorship in the late 1970s, promoting democratic reforms and social welfare programs. The party has been part of various governments, both in coalition and as the ruling party. Its leadership has included notable figures such as Felipe González and José Luis Rodríguez Zapatero. The PSOE continues to influence contemporary Spanish politics, focusing on issues like equality, labor rights, and environmental sustainability.