The Romeo and Juliet prologue sets the scene for the tragedy that follows. It introduces the characters of Romeo and Juliet and the intense love they share, while foreshadowing the tragic end that awaits them.
The prologue also reveals the deep divide between the two families, the Montagues and Capulets, which intensifies the already volatile emotions of the two young lovers.
The Prologue is written in a heroic couplet, i.e., two lines of iambic pentameter verse that rhyme:
"Two households, both alike in dignity,/In fair Verona, where we lay our scene."
It follows a traditional Shakespearean form, summarizing what is to happen in the play. It opens with a slave of the Capulets announcing the opening of the story:
"From forth the fatal loins of these two foes/A pair of star-cross'd lovers take their life."
The prologue also outlines the tragedy of the lovers, who fall in love despite the enmity between their families:
"The fearful passage of their death-mark'd love,/And the continuance of their parents' rage,/Which, but their children's end, nought could remove."
Finally, the Chorus states that the play will touch upon universal themes of fate and fortune, and might provide its audience with an example of how to live their lives:
"For never was a story of more woe/Than this of Juliet and her Romeo."
In summary, the Prologue of Romeo and Juliet sets the stage for a classic love story - two young lovers, their intense passion, and the conflict between their families that will lead to their ultimate fate.