The Partido de Liberación Nacional (PLN) is a political party in Costa Rica, founded in 1951. It is known for its social democratic ideology and has played a significant role in the country's political landscape. The PLN has been in power multiple times and has focused on issues such as social welfare, education, and economic development. The party's symbol is a green and white flag, representing its commitment to environmental sustainability and social justice. Over the years, the PLN has produced several prominent leaders, including former presidents like José Figueres Ferrer and Laura Chinchilla, contributing to its influence in Costa Rican politics.