The Little Mermaid is a popular fairy tale by the Danish poet and author Hans Christian Andersen about a young mermaid willing to give up her life in the sea and her identity as a mermaid to gain a human soul and the love of a human prince.Written originally as a ballet, the tale was first published in 1837 and has been adapted to various media including musical theatre and animated film.

The Little Mermaid lives in an underwater kingdom with her father the sea king; her grandmother; and her five elder sisters, each born one year apart. When a mermaid turns 15, she is allowed to swim to the surface to watch the world above, and as the sisters become old enough, one of them visits the surface every year. As each of them returns, the Little Mermaid listens longingly to their various descriptions of the surface and of human beings.

When the Little Mermaid's turn comes, she ventures to the surface, sees a ship with a handsome prince, and falls in love with him from a distance. A great storm hits, and the Little Mermaid saves the prince from a near-drowning. She delivers him unconscious to the shore near a temple. Here she waits until a young girl from the temple finds him. The prince never sees the Little Mermaid.

The Little Mermaid asks her grandmother whether humans can live forever if they do not drown. The grandmother explains that humans have a much shorter lifespan than merfolks' 300 years, but that when mermaids die they turn to sea foam and cease to exist, while humans have an eternal soul that lives on in Heaven. The Little Mermaid, longing for the prince and an eternal soul, eventually visits the Sea Witch, who sells her a potion that gives her legs, in exchange for her tongue . The Sea Witch warns, however, that once she becomes a human, she will never be able to return to the sea. Drinking the potion will make her feel as if a sword is being passed through her, yet when she recovers she will have two beautiful legs, and will be able to dance like no human has ever danced before. However, it will constantly feel like she is walking on sharp swords hard enough to make her bleed. In addition, she will only get a soul if she finds true love's kiss and if the prince loves her and marries her, for then a part of his soul will flow into her. Otherwise, at dawn on the first day after he marries another woman, the Little Mermaid will die brokenhearted and disintegrate into sea foam...