Concerto grosso and concerto

Concerto grosso is a form of Baroque music where music is played by small groups of soloists (the concertino) and the full orchestra ( the ripieno ).In the Baroque Period there would be a Harpsichord which is a distinct sign of the Baroque Period. 
Arcangelo Corelli-

Visual Example

The concerto is a piece where it's a soloist playing the 'main' part not a group, it's accompanied by the orchestra.

In the classical Era concertos were often started by a small Orchestra that built the piece before the soloist would come in.
There would be concerto's for certain instruments such as cello's.


Romantic concerto: This had a bigger orchestra, it was composed in three parts in which the solo performer played whilst accompanied by the orchestra. Pieces were mainly composed for Violin, Cello and piano. They would display all the talents of virtuoso's.