Once you understand ping, jitter should also make sense. Jitter is merely the variance in measuring successive ping tests. Zero jitter means the results were exactly the same every time, and anything above zero is the amount by which they varied. Like the other quality measurements, a lower jitter value is better. And while some jitter should be expected over the Internet, having it be a small fraction of the ping result is ideal.
En gros, ça fait plusieurs tests successif pour voir si ton ping reste stable.
Si c'est 0 ça veut dire no soucy, + c'est élevé plus ton ping varie en fonction des différents tests.
Donc 0 ou 1 je suppose que ça pose pas de soucis