Argentine Tango is a dance that originated in Argentina and Uruguay. A waltz is a ballroom and folk dance in 3/4 (help·info) time, done primarily in closed position.
Viennese Waltz is a ballroom dance, its origins date back to 12th/13th centuries. It originally comes from Bavaria and it used to be called the “German”. There have been articles in the Paris magazine “La Patrie” claiming that waltz was first danced in Paris in 1178, not under the name waltz but as the Volta from the Provence.
The Samba originated from Brazil and is that country’s official dance. It is a festival dance and is danced in street festivals and parades. People dancing in the Nottinghill Carnival are Samba dancers, which is similar to the people dancing at Carnival in Rio. A Samba dancer is known in Brazil as a Sambista.