Piano Tuning means tightening or loosening the strings for each note to achieve a the best musical sound. Most pianos have about 220 strings total.
Most often, this will be raising the pitch of a piano that has not been tuned for a long time. After a time, the pitch of the notes of the piano goes too low to be able to tune it at the same time as pulling it up. This is a little like a pre-tuning.
A piano has thousands of wooden, felt and metal parts working together to allow you to express yourself musically. Use, abuse, and aging can cause problems needing attention. Services include all repairs, action regulation, parts replacements.