Human: Why did the Autobots and Decepticons fight in the movie ‘Transformers’? Assistant: 
The Autobots and Decepticons were two factions of robots that were at war. The Autobots were led by Optimus Prime, and the Decepticons were led by Megatron. The Autobots were trying to protect Earth from the Decepticons, who were trying to take over the planet.