The term kegel refers to pelvic muscles that tighten the pelvic floor. They close the 3 openings: urethra, vagina, and anus.
It's good to practice daily both quick squeeze & relax, as well as squeeze & hold (10 seconds) to optimize all functions of these muscles. Feel it just inside vaginal opening. Like any muscle regular exercise
is necessary, otherwise "you'll lose it if you don't use it.".