Adjusting the pitch of something is a process of changing the frequency of a sound or note. It is commonly used in music to make sure that all instruments are playing in the same key. Tuning is the act of adjusting the pitch of an instrument or voice to match the desired sound. This is done by adjusting the tension of the strings, the length of the strings, or the position of the bridge. Tuning is an important part of any musician's practice routine and is essential for creating a harmonious sound.