An aria is a solo vocal piece typically found in operas, oratorios, and cantatas. It allows a singer to express deep emotions and showcase their vocal skills. Arias often feature elaborate melodies and are accompanied by orchestral music, highlighting the singer's performance. In an opera, an aria usually occurs at a pivotal moment in the story, allowing characters to reflect on their feelings or thoughts. Famous examples include Mozart's "Là ci darem la mano" and Puccini's "Nessun dorma." These pieces are integral to the narrative, enhancing the emotional impact of the performance.