The jiu jitsu guard is a BJJ position with tons of various types. And this depends on the points of control (grips) that you install.
For example, there are the Brazilian ju jitsu closed guard, open guard, spider guard, half guard, butterfly guard just to name a few.
Furthermore, some jiu-jitsu guard positions are perfect when your opponent standing and other guards are effective when he or she is kneeling.
https://jiujitsu-news.com/jiu-jitsu-guard-all-what-you-need-to-know/