Network jitter refers to irregularities in sending data packets, which can cause issues such as voice break-ups or dropped calls. Common types of jitter include constant, short-term delay variation, and transient jitter. Causes of network jitter may include wireless networks, insufficient bandwidth, lack of packet prioritization, and outdated equipment. Jitter is measured by calculating the average packet-to-packet delay time using tests like double endpoint, single endpoint, and bandwidth tests. Acceptable jitter levels should be below 30 milliseconds to prevent distortion or dropped calls. To prevent network jitter, businesses can test their internet connection quality, prioritize packet flow, upgrade tools, schedule system updates outside working hours, use jitter buffering, and find a reliable VoIP or UCaaS provider.