Ektara is a one-string instrument most often used in traditional music from Bangladesh, India, Egypt, and Pakistan.
In origin the ektara was a regular string instrument of wandering bards and minstrels from India and is plucked with one finger. The ektara usually has a stretched single string, an animal skin over a head (made of dried pumpkin/gourd, wood or coconut) and pole neck or split bamboo cane neck.
Pressing the two halves of the neck together loosens the string, thus lowering its pitch. The modulation of the tone with each slight flexing of the neck gives the ektara its distinctive sound. There are no markings or measurements to indicate what pressure will produce what note, so the pressure is adjusted by ear.