What is the significance of a fermata in a piano piece and how does it affect the overall performance?

A fermata in a piano piece is a symbol that indicates a pause or hold on a note or chord. It is used by the performer to add expression and create a sense of anticipation or tension in the music. The fermata allows the performer to hold a note longer than its written value, adding a sense of drama and allowing for personal interpretation. This can greatly affect the overall performance by adding emotional depth and highlighting key moments in the music.