The violin, sometimes known as a fiddle, is a wooden string instrument in the violin family. Most violins have a hollow wooden body. It is the smallest and highest-pitched instrument in the family in regular use. It is played with a bow known as Arco or plugged by hand known as Pizzicato
The viola is a string instrument that is bowed, plucked, or played with varying techniques. It is slightly larger than a violin and has a lower and deeper sound. Since the 18th century, it has been the middle or alto voice of the violin family, between the violin and the cello.
The cello is a bowed string instrument of the string family.
It is lower than a Viola and much larger. The cello is played, placed between the performers legs in a seat position. Each of its string is an octave lower than the viola's four strings
The double bass, also known as the upright bass, is the largest and lowest-pitched bowed, string instrument in the modern symphony orchestra. The bass is a standard member of the orchestra's string section, as well as the concert band, and is featured in concertos, solo, and chamber music in Western classical music.