Cylons are fictional robotic beings from the Battlestar Galactica universe, originally created by humans as a labor force. Over time, they evolved into sentient beings, leading to a devastating conflict known as the Cylon War. These machines are known for their advanced technology and ability to mimic human appearance, which complicates the struggle between humans and Cylons. In the series, Cylons are depicted in various forms, from simple mechanical units to sophisticated humanoid models. Their quest for identity and purpose raises philosophical questions about consciousness and the nature of life, making them a compelling element of the Battlestar Galactica narrative.