Antonio Vivaldi was an Italian composer who lived during the Baroque period. He is best known for his violin concertos, particularly 'The Four Seasons.' Vivaldi's music is characterized by its rhythmic vitality, virtuosic violin writing, and colorful orchestration. His compositions also include operas, sacred choral music, and chamber music. Vivaldi's music has had a lasting impact on the development of Western classical music and remains popular to this day.