World usually[source?] means a planet. When people say "the world" they usually mean the planet Earth. Humans and non-human animals live in the world. The Earth is the only planet that we know of that has life.
Before people discovered that Earth is a planet, they often used "World" to mean "Universe". They still sometimes use it to mean all humans or all civilization. Sometimes they mean just a part of Earth such as Western world or Islamic world.
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