Piano is marked as " p " in music. It indicates the part of the music should be played softer. "Piano" has no absolute value in music (the "Dynamic Markings" in music cannot be measured in decibels). Typically, composers use "Piano" to indicate "the music being softer than the phrases before or after it".

Example of Piano

Basic Dynamics: Piano, Forte, Crescendo and Decrescendo - Animated Rhythm Lesson

Writer: Frankie Chan