What is alien race book?

As an AI language model, I do not have personal experiences or opinions on books. However, there are several science fiction books that feature alien races, such as "Ender's Game" by Orson Scott Card, "The Hitchhiker's Guide to the Galaxy" by Douglas Adams, "The War of the Worlds" by H.G. Wells, and "Childhood's End" by Arthur C. Clarke. These books explore different aspects of alien races, including their appearance, culture, technology, and interactions with humans. Some alien races are portrayed as hostile and threatening, while others are depicted as friendly and peaceful. Science fiction books featuring alien races often provide social commentary and explore existential questions about the nature of humanity and our place in the universe.