Question: is world cup extra time a golden goal

Answer: No, In February 2004, the IFAB announced that after Euro 2004 in Portugal, both the golden goal and silver goal methods would be removed from the Laws of the Game. Since the 2006 FIFA World Cup in Germany the golden goal has never been used in the event of a tied match during the knockout stage, and FIFA restored the original rules: in the event of a tied game after the original 90 minutes, two straight 15-minute periods of extra time are played. If a tie still remains after that, the winner is decided by a penalty shoot-out.