The target makes no sound, and can't use sonic attacks, auditory actions, or cast spells aloud.
Illusion
Manipulate
Subtle
Rank
2
Traditions
Divine, Occult
Traits
Illusion, Manipulate, Subtle
Cast
2 actions
Range
touch
Targets
1 willing creature
Duration
1 minute
The target makes no sound, and can't use sonic attacks, auditory actions, or cast spells aloud.
Heightened
4th
The spell creates an aura in a 10-foot emanation around the touched creature, silencing all sound in or passing through it. While within the aura, creatures are subject to the same effects as the target. Depending upon the position of the effect, a creature might notice the lack of sound reaching it (blocking off the noise coming from a party, for example).
Source: Pathfinder Player Core, p. 357
Bring Silence into a Pathfinder 2e game with The DM Screen.