Of all the gopis, Radharani is the dearmost.  Her name means that She is the most excellent worshiper of Lord Krishna.

The transcendental goddess Srimati Radharani is the direct counterpart of Lord Sri Krishna. She is the central figure for all the goddesses of fortune. She possesses all the attractiveness to attract the all-attractive Personality of Godhead. She is the primeval internal potency of the Lord. She is a tenderhearted feminine counterpart of the supreme whole, resembling the perfectional stage of the worldly feminine nature.

The beauty of Srimati Radharani's eyes forcibly devours the beauty of newly grown blue lotus flowers, and the beauty of Her face surpasses that of an entire forest of fully blossomed lotuses. When one sees the face of Radharani, he immediately hates the beauty of the moon. Her bodily luster seems to place even gold in a painful situation. Thus the wonderful, unprecedented beauty of Srimati Radharani is awakening Vrindavana.

The Vraja-devis or gopis are Her expansions and assist in the increase of rasa, or the divine loving pastimes.