There are numerous differences. The main one is that Brazilian Jiu-Jiu-Jitsu (BJJ) focuses more on ground grappling while Classical Jiu-Jitsu emphasizes standing grappling and striking. All types of Jiu-Jitsu are based on submitting your opponent; however, BJJ is the only form of Jiu-Jitsu that heavily emphasizes positional strategy and control before doing so. This strategy will allow you to be completely dominant, safe, and calm to apply a finishing hold. Another fundamental difference is that in BJJ, students will have the chance to practice and drill moves while their partner resists 100%.