No-Gi training is a more modern form of Jiu-Jitsu. It focuses less on the grappling aspect and more on take-down elements. You'll still learn ways to force an attacker to submit, you'll just learn in a much different way because the Gi is not present.
While it may seem untraditional, no-Gi training still offers a number of unique benefits for those looking to learn martial arts. No-Gi training often: