Which estate was the bourgeoisie a part of during the Old Regime?

During the Old Regime in France, the bourgeoisie was part of the Third Estate. This estate comprised the common people, including merchants, professionals, and laborers, who were not part of the clergy (First Estate) or the nobility (Second Estate). The bourgeoisie played a significant role in the economic development and ultimately became a key force in the French Revolution, advocating for political rights and social change.