Lithuania is a parliamentary republic where the President is the head of state and the Prime Minister is the head of government. The Seimas, Lithuania's unicameral parliament, consists of 141 members elected for four-year terms. Political parties play a significant role, with major parties including the Lithuanian Farmers and Greens Union and the Homeland Union. Lithuania's political landscape is characterized by a multi-party system, allowing for diverse representation. The country is a member of the European Union and NATO, influencing its foreign policy and security strategies. Key issues in Lithuanian politics include economic development, social welfare, and relations with neighboring countries.