Jitter and delay are naturally tied to each other, but they are not the same. They are both important to networking and have a significant impact on real-time communications. Check out this infographic to learn about the difference between jitter and delay.
This post is based off of a Stack Overflow answer by Balázs Kreith, one of our engineers at callstats.io. In it, he details the differences between delay and jitter and how to calculate jitter. Read his answer on Stack Overflow.