The conflict in William Shakespeare's play "Hamlet" is initiated by the appearance of the ghost of King Hamlet, the previous king of Denmark, who was murdered by his own brother, King Claudius. The ghost appears to Prince Hamlet, the main character, and reveals to him the truth about his father's death. This revelation sets in motion the central conflict of the play as Prince Hamlet is consumed by thoughts of revenge and struggles with whether or not to take action against King Claudius.
The ghost's appearance and the information it provides serves as the catalyst for Prince Hamlet's journey of self-discovery and ultimately, his quest for revenge. The ghost's presence also creates a sense of tension and unease in the court of Denmark, as the truth about King Hamlet's death is revealed and the stability of the kingdom is threatened.
In conclusion, the appearance of the ghost of King Hamlet is the defining moment that initiates the conflict in "Hamlet". It sets the stage for Prince Hamlet's journey of self-discovery and revenge, as well as for the political and emotional turmoil that unfolds throughout the play.