Jitter is the inconsistency in arrival time of the data packets that carry a VoIP call. When packets arrive unevenly, audio breaks up, sounds robotic, or drops words.
Jitter is usually a network problem: congestion, weak Wi-Fi, or insufficient bandwidth. Quality-of-service settings and a jitter buffer smooth it out.
A well-run cloud phone service manages jitter for you, so calls stay clear without your team tuning the network.