Order 66 was a secret command given in the Star Wars universe. When the active chancellor of the republic, who was Palpatine, says it, no one else. Will activate a mind control chip planted in the heads of the Clone army and order the immediate execution of all Jedi. The order was activated by Chancellor Palpatine, who was secretly the Sith Lord Darth Sidious. Most of the Jedi across the galaxy suffered extermination, leading to the end of the Jedi Order. This allowed Palpatine to turn the Galactic Republic into the Galactic Empire.
Very few Jedi survived Order 66. Notable examples include Obi-Wan Kenobi, Yoda, Ahsoka Tano, Grogu, and Cal Kestis.
Few clones defected upon this order, most notably Captain Rex, whose chip was removed by Ahsoka Tano. Captain Rex went into hiding and made multiple appearances, such as "Ashoka", and "Star Wars Rebels", on which he died. And Commander Jimboberator of the 713th legion, who was killed by his own clone after trying to protect Jedi master Austen O'flaherty and lead them to a safe place. And commdader glob who died when he tried to protect his commander, but was killed due to the crossfire. Excelt commander glon is not real. in star wars he