The definition of Utopia is a society or community setting where the people experience the ideal and most remarkable life possible. By contrast, dystopia emphasizes the complete opposite, which is a place of, particularly disturbing living and working conditions for most people.
Most of all, societal and governmental systems are inadequate and corrupt. Utopia is what many people think of as paradise. It's all about butterflies and flowers blooming and never-ending sunshine. It is a place where people are perpetually happy all the time.
The idea of Utopia seems impossible. Therefore, it is a complete work of fiction. In a dystopian world, skies are dull, grey, and lifeless. The sun does not shine down on the people.