Phonation is the process of producing sound through the vibration of the vocal cords located in the larynx, or voice box. When air from the lungs passes through the closed vocal cords, they vibrate, creating sound waves. The pitch and volume of the sound can be altered by changing the tension and length of the vocal cords. This process is essential for speech and singing, allowing humans to communicate effectively. Factors such as breath control, vocal cord health, and resonance in the vocal tract can influence the quality of phonation. Proper technique is important for maintaining vocal health and achieving desired sound qualities.