Versos Blancos, or 'blank verses', are unrhymed lines of poetry that follow a specific metrical pattern, typically using iambic pentameter. This form allows for a natural flow of language and flexibility in expression, making it a popular choice among poets who seek to convey deeper emotions and ideas without the constraints of rhyme. In the context of various poetic works, including 'El romance del rey moro', Versos Blancos can enhance the rhythmic quality while maintaining a serious tone.