The tar is a long-necked, waisted lute family instrument, used by many cultures and countries including Iran, Azerbaijan, Uzbekistan, Armenia, Georgia, Tajikistan, Turkey, and others near the Caucasus and Central Asia regions. The older and more complete name of the tār is čahārtār or čārtār, meaning in Persian "four string",. This is in accordance with a practice common in Persian-speaking areas of distinguishing lutes on the basis of the number of strings originally employed. Beside the čārtār, these include the dotār, setār, pančtār, and šaštār or šeštār.

A lute is any plucked string instrument with a neck and a deep round back enclosing a hollow cavity, usually with a sound hole or opening in the body. It may be either fretted or unfretted.