Purple belt is the intermediate adult ranking within the art of Brazilian Jiu-Jitsu, coming after the rank of blue belt and before brown belt. It is often considered one of the longer held ranks, and typically takes at least 4–5 years of dedicated training to achieve.
Even as an “intermediate” rank, the purple belt level practitioner holds a formidable amount of knowledge, and purple belts are generally considered qualified to instruct lower belts. In other martial arts, students with a similar amount of time and effort invested would often be ranked as a black (instructor) level belt.
The IBJJF requires that a student be at least 16 years old and have spent a minimum of 2 years ranked as a blue belt to be eligible to receive a purple belt (with slightly different requirements for those transitioning straight from the youth belts).