A more thorough explanation:

Definition: A posthumous work is a creative work that is published after the author's death.

Examples:

• The novel "The Girl with the Dragon Tattoo" by Stieg Larsson was published posthumously.
• The artist Vincent van Gogh's paintings became famous after his death.

These examples illustrate the definition of posthumous work because they are both creative works that were published or became famous after the author's death. In both cases, the author did not have the opportunity to see the success of their work during their lifetime.