How do you make hair bun?

I usually twist the hair while it is in a ponytail then wrap the twisted hair around the ponytail. There are also bun-builders that can assist you in bun-making. You would make a ponytail, but the ponytail through donut-looking bun builder then spread the hair out over it. Put a hair-tie around it, then twist or braid the excess hair around the bun.