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The flag of the Socialist Republic of Vietnam, or cờ đỏ sao vàng (red flag with a gold star), also cờ Tổ quốc (flag of Fatherland), was designed in 1940 and used during an uprising against the French in southern Vietnam that year. The red background symbolizes bloodshed, revolution and struggle. The yellow star represents the five main classes in Vietnamese society — workers, peasants, soldiers, intellectuals, and businessmen.The flag was used by the Viet Minh, a communist-led organization created in 1941 to oppose Japanese occupation. At the end of World War II, Viet Minh leader Ho Chi Minh proclaimed Vietnam independent and signed a decree on 5 September 1945 adopting the flag as the flag of the North Vietnam. The DRV became the government of North Vietnam in 1954 following the Geneva Accords. The flag was modified on 30 November 1955 to make the rays of the star sharper. Until the end of the Vietnam War in 1975, South Vietnam used a yellow flag with three horizontal red stripes through the middle. The red flag of North Vietnam was later adopted as the flag of the unified Vietnam in 1976. The flag of Vietnam is the only Southeast Asian flag that does not contain the colour white, with red and yellow being the main historical and national colours.

Source: Wikipedia