The kneeling assisted chest dip uses a dip machine or resistance band support to reduce the amount of bodyweight you press, making the dip pattern accessible before you can do a full unassisted dip. It still trains the chest, front shoulders, and triceps through the same pressing motion, just with lighter overall load. It's a useful stepping stone toward full bodyweight dips.
Log your assisted chest dip (kneeling) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.