The Little Mermaid is a 1989 animated film by Disney, in which a mermaid princess named Ariel dreams of becoming human and falls in love with a human prince, striking a deal with a sea witch to make it happen. The film concludes with Ariel becoming human and marrying the prince, providing a happy ending.
The "The Little Mermaid" title lettering of the movie poster closely resembles the Mermaid font, created by Kustren, a user on DeviantArt. You can easily download this font for free from the Fonts Used Section.