Androids (人造人間, Jinzōningen; lit. "Artificial Humans") are robotic/cyborg humans, most of them created by the evil scientist Dr. Gero. Most of the androids are said to have unlimited energy and have eternal life, as well as having no aura (unlike Saiyans, Humans, and others) so nobody can track them with either Scouters or Ki Sense.
Android Type's -
1. The kind with no drawbacks and an unlimited power supply
2. The kind which requires constant intake of energy, usually stolen from victims, to keep their power reservoir from draining, which would cause the android to malfunction. Curiously, Dr. Gero oversees his configuration into the latter, rather than the type with no apparent limitations
3. Bio-mechanical constructed bio-artificially rather than from machine parts and/or a human base.
Android Bases -
1. "Cyborgs", androids made from an original human as a base
2."Total artificial construct types", androids which were made up completely from mechanical parts
Androids served as main villains during the Android Conflict, each serving a purpose of their own. Originally, all of the androids were plans used to kill Goku, however, most of the androids turned to the good side or were killed. However, in Future Trunks' Alternate Timeline, the androids succeeded in their plans for world destruction, managing to kill all of the main Z Fighters (except for Goku, who died of a heart virus, and Gohan, who survived but was killed 13 years later) until finally being killed by Trunks almost 20 years later. They do not require food and water.