What is the aria of an opera?

In opera, an aria is a solo piece for a singer, usually accompanied by an orchestra. Arias are often used to express a character's emotions or thoughts, and can be either lyrical or dramatic. They are typically written in da capo form, which consists of three sections: A, B, and A'. The A section is the main melody, the B section is a contrasting section, and the A' section is a repetition of the A section. Arias are often considered to be one of the most challenging and rewarding aspects of opera singing, and can showcase a singer's vocal prowess and演技 abilities.