The Ender's Game series (often referred to as the Ender saga and also the Enderverse) is a series of science fiction books by Orson Scott Card. The series started with the novelette "Ender's Game", which was later expanded into the novel of the same title. It currently consists of fifteen novels, thirteen short stories, 47 comic issues, an audioplay, and a film. The first two novels in the series, Ender's Game and Speaker for the Dead, each won both the Hugo and Nebula Awards, and were among the most influential science fiction novels of the 1980s.
The series is set in a future where mankind is facing annihilation by an aggressive alien society, an insect-like race known formally as "Formics", but more colloquially as "Buggers". The series protagonist, Andrew "Ender" Wiggin, is one of the child soldiers trained at Battle School (and eventually Command School) to be the future leaders for the protection of Earth.
Starting with Ender's Game, five novels (also known as the "Ender Quintet") have been released that tell the story of Ender. Card first wrote Ender's Game as a novelette, but went back and expanded it into a novel so that he could use Ender in another novel, Speaker for the Dead. That novel takes place three thousand and two years after Ender's Game, although, due to relativistic space travel, Ender himself (now using his full name Andrew) is only 36, making him only 25 years older than he was at the end of the Formic Wars.
While the first novel concerned itself with armies and space warfare, the novels in the Speaker trilogy (Speaker for the Dead and its two sequels Xenocide and Children of the Mind) are more philosophical in nature. They deal with the difficult relationship between the humans and the "Piggies" (or "Pequeninos"), and Andrew's (Ender's) attempts to stop another xenocide from happening.