Traditional opera typically dealt with very serious or tragic themes. Opera buffa is instead a type of comedic opera. Traditional operas typically had three to four acts; where opera buffas typically had two acts. Opera buffas are more likely to be based on a contemporary subject with a realistic story. The base voice is much more common in opera buffa.
This is an example of a new style of opera called opera buffa that emerged during the classical period. it differed from opera in previous periods because