The ghost of King Hamlet is a pivotal character in William Shakespeare's play, Hamlet. He appears as a spectral figure, representing the deceased king of Denmark, who has been murdered by his brother, Claudius. The ghost reveals the truth about his death to his son, Hamlet, urging him to seek revenge against Claudius. This ghostly apparition symbolizes themes of betrayal, revenge, and the supernatural. It serves as a catalyst for Hamlet's internal conflict and moral dilemmas throughout the play. The ghost's presence raises questions about the afterlife and the consequences of one's actions.