In ancient Greek stories, Elysium is the place of complete happiness where good people go after they die — often heroes, not every soul. It is a bright, gentle land, sometimes called the Elysian Fields, unlike the dark underworld where most spirits go. That is still the meaning in myths and in class. Though actually, later writers borrowed the name for any place that feels perfectly at rest: a garden, a quiet island, a holiday that went right. The word is literary. You will not hear it much in everyday talk; it belongs to books, speeches, and rather grand praise. People who say a beach was Elysium are stretching the old story on purpose.