1) Instruments that produce sound through the vibration of strings, including the piano, harpsichord, lute, etc.
2) Instruments related to the violin that comprise the core of the symphony orchestra. Stringed instruments, from highest to lowest, are the violin, viola, violoncello ('cello) and double bass (bass). This family of instruments is also informally referred to as the strings.
Violists and violinists play with the instrument under the chin, 'cellists with the instrument between their knees, while double bass players, because the instrument is so large, typically play standing up or perched on a high stool.
In the symphony orchestra, the violins are divided into two sections: first violins and second violin, while the violas, 'celli, and basses are usually not divided. The two violin sections with the viola section are known collectively as the high strings.
The 'celli and bass sections are known collectively as the low strings.
String players usually play arco, with the bow, using a staccato or legato bowing technique. Other less common techniques for playing stringed instruments include pizzicato, tremolo, and col legno.