1. Violin: The violin is the highest-pitched string instrument in the orchestra. It is played by drawing a bow across four strings, and is known for its versatility and expressive capabilities.
2. Viola: The viola is a larger version of the violin and has a lower pitch. It is also played with a bow and adds a rich, warm sound to the orchestra.
3. Cello: The cello is larger still and has a deep, resonant sound. It is played while seated, with the instrument supported between the legs.
4. Double Bass: The double bass is the largest and lowest-pitched string instrument in the orchestra. It is played standing up, with the instrument resting on the floor.
Together, these four instruments form the core of the string section and provide the foundation for many orchestral works.