What is the plot of movie The Seventh Seal?

In medieval Sweden, during the Black Death, Antonius Block, a knight returning home from the Crusades, encounters Death, who has come to take him. In order to gain a temporary reprieve, Antonius challenges Death to a game of chess. As they play, Antonius observes the horrors of the plague-ravaged countryside and encounters various figures, including a group of traveling actors, a witch, and a priest questioning his faith. Throughout his journey, Antonius grapples with existential questions about life, death, and the existence of God.