also: ポニーテイル
A hairstyle where the hair is gathered and tied at the back of the head, hanging down like a horse's tail. Common in everyday Japanese.
She always wears her hair in a ponytail.
A ponytail is convenient when exercising.
She has her hair in a ponytail.
I always tie my hair into a ponytail when I exercise.
A ponytail really suits her.