A piano tuner is a skilled professional who adjusts the strings of a piano to ensure it produces the correct pitch. Over time, factors like humidity and temperature changes can cause a piano to go out of tune. Tuners use specialized tools, such as a tuning fork or electronic tuner, to measure and correct the pitch of each string. In addition to tuning, a piano tuner may also perform maintenance tasks, such as regulating the action and voicing the instrument. Regular tuning is essential for keeping a piano in good condition and ensuring it sounds its best for players and listeners alike.