ABAB is a common rhyme scheme used in poetry, where the first and third lines rhyme with each other, and the second and fourth lines rhyme with each other. This pattern creates a rhythmic and musical quality, making the poem more engaging. It is often found in various forms of poetry, including sonnets and ballads. The ABAB rhyme scheme allows poets to express their ideas and emotions effectively while maintaining a structured format. This technique can enhance the overall aesthetic of the poem, drawing readers in and making the themes more memorable. Many famous poets, such as William Shakespeare and Robert Frost, have utilized this scheme in their works.