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Jitter is a variation or dislocation in the pulses of a digital transmission; it may be thought of, in a way, as irregular pulses. Jitter can manifest through variations in amplitude, signal strength, and other elements of such waves. The usual causes include connection timeouts, connection time lags, data traffic congestion, and interference. Simply put, this jitter is an undesirable output of system flaws and interruptions.

To understand jitter, one must remember that data (whether audio, video, pictures or text) is seldom sent out wholly. Data is split up into manageable 'packets' with headers and footers that indicate the correct order of the data packets when it's the client computer's turn to organize them for playback. When a jitter occurs, some data packets may be lost in transit or the code for data packet assembly in the receiving machine may be wiped out.

Thus when jitters occur, computer monitors and computer processors may malfunction, files may get lost, downloaded audio files may acquire noise, Internet phone calls may get interrupted, suffer time lags or get disconnected. Due to its undesirable consequences, jitter is an important consideration in the design of all communications links.

In simple words;

Jitter is the amount of fluctuation or choppiness in a signal. The higher the jitter the more inconsistent a signal is. You want the signal to be as steady as possible. Jitter can be caused by network congestion or connection issues. A jittery connection causes trouble for online gaming and internet phone service

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Posted by grr

An uneven arrival of packets.

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Posted by priyadarshan