Final answer:
The most popular types of concerto in the Baroque era were solo concerto and concerto grosso.
Step-by-step explanation:
The two most popular types of concerto in the Baroque era were solo concerto and concerto grosso. In a solo concerto, a single soloist is accompanied by an orchestra. Examples include Vivaldi's "The Four Seasons" and Bach's Brandenburg Concertos.
In a concerto grosso, a small group of soloists (known as the concertino) is accompanied by a larger orchestra (known as the ripieno). Examples include Corelli's Concerti Grossi and Handel's Concerti Grossi Op. 6.. In contrast, the concerto grosso involved a small group of soloists, called the concertino, contrasted with the full orchestra, or the ripieno.