Sri Krishna is the Supreme Personality of Godhead and is worshipped along with His consort Srimati Radharani. People say that Krishna is the eighth avatara of Lord Vishnu. But Brahma Samhita, a prayer composed by Lord Brahma, mentions that Krishna is the original purusha and He is the source of Lord Maha Vishnu. This is also confirmed in Srimad Bhagavatam. He appeared as the son of Devaki and Vasudeva and performed various pastimes along with His brother Balarama.
Srimati Radharani is the eternal consort of Lord Sri Krishna. She is the repository of all good qualities and the crest jewel among all the lovely consorts of Lord Krishna. Her mind, senses and body are steeped in love for Krishna. She is Krishna’s own energy and there is no difference between the energy and the energetic. Without energy, there is no meaning to the energetic, and without the energetic, there is no energy. Similarly, without Radha there is no meaning to Krishna, and without Krishna, there is no meaning to Radha.