The violin, also called the fiddle, is a string instrument in the violin family. It is the most common or highest pitched bowed instrument in an orchestra.
Violas
The viola is a string instrument in the violin family. It is slightly larger than a violin and has a lower pitched sound.
Cellos
The cello, also called the violoncello, is a string instrument in the violin family. It is the second lowest-pitched stringed instrument in an orchestra, after the double bass.
Double basses
The double bass, also called the bass fiddle or violone, is the largest and lowest-pitched bowed string instrument in the orchestra.