Brazilian Jiu-Jitsu (BJJ) is a martial art and combat sport that focuses on grappling and ground fighting. It originated in Brazil in the early 20th century, and was developed from Judo and traditional Japanese Jiu-Jitsu. BJJ emphasizes the use of technique and leverage over brute strength, making it an effective martial art for practitioners of any size or gender.

In BJJ, practitioners seek to control their opponents through a series of techniques such as joint locks, chokes, and throws, with the ultimate goal of submitting them. The sport is often practiced in a gi, a traditional uniform that consists of a jacket and pants made of heavy cotton. However, BJJ can also be practiced without the gi, which is known as no-gi grappling.

BJJ has become increasingly popular in recent years, and it is now practiced by people of all ages and backgrounds around the world. It is also a popular form of self-defense training, as its focus on ground fighting makes it well-suited for real-world situations where fights often end up on the ground.