Opera seria, a genre of opera that was popular during the 18th century, is characterized by its formal structure, elevated style, and serious subject matter. There are a number of synonyms for the term opera seria, including serious opera, heroic opera, and grand opera. These synonyms all emphasize the serious and grandiose nature of the genre, highlighting the use of music and drama to explore themes of heroism, tragedy, and virtue. Despite its historical significance, opera seria is less commonly performed today, with many opera companies opting for more contemporary styles and genres. Nonetheless, the legacy of opera seria can still be felt in many classical works and operatic traditions.