The biggest difference between the two sports is how techniques are executed. Kickboxing uses techniques that require players to fight while standing up.
You kick, hit, and punch upright. Jiu-Jitsu, which originated from Brazil, is a contact sport that involves ground fights. This means you will be grappling and wrestling on the ground.
Jiu-jitsu also focuses on pinning down or locking a specific body part of the opponent to discourage mobility and to decrease the effectiveness of their attacks.
There are more attack variations for jiu-jitsu. However, it is also very demanding since fighting on the ground doesn’t give you much advantage unless you are well-trained with the technique.