"Et Tu, Brute?" is a famous phrase from William Shakespeare's play, Julius Caesar. It is spoken by Julius Caesar as he is being assassinated by a group of conspirators, including his close friend, Brutus. The phrase translates to "And you, Brutus?" and signifies Caesar's shock and betrayal at Brutus's involvement in the plot against him. The line has become a symbol of betrayal and is often referenced in discussions about loyalty and friendship. It highlights the emotional impact of being betrayed by someone trusted, making it a powerful moment in literature and history.