Fiction refers to literature or a story that is not based on facts or truth. The people and the events in the material are imaginary and the ending may be happy or sad. Monster stories and science fiction tales are based on the imagination of the writer and not on a real event or creatures that actually exist in the real world.
Imagination and fiction make up more than three-quarters of our real life
A writer is congenitally unable to tell the truth and that is why we call what he writes fiction