Yogamāyā is the principal potency of the Personality of Godhead. In the Vedas it is stated that the Lord, the Supreme Personality of Godhead, has multipotencies: parāsya śaktir vividhaiva śrūyate (Cc. Madhya 13.65, purport). All the different potencies are acting externally and internally, and Yogamāyā is the chief of all potencies. The Lord ordered the appearance of Yogamāyā in the land of Vrajabhūmi, in Vṛndāvana, which is always decorated and full with beautiful cows. In Vṛndāvana, Rohiṇī, one of the wives of Vasudeva, was residing at the house of King Nanda and Queen Yaśodā. Not only Rohiṇī but many others in the Yadu dynasty were scattered all over the country due to their fear of the atrocities of Kaṁsa. Some of them were even living in the caves of the mountains.
The Lord thus informed Yogamāyā: “Under the imprisonment of Kaṁsa are Devakī and Vasudeva, and at the present moment My plenary expansion Śeṣa is within the womb of Devakī. You can arrange the transfer of Śeṣa from the womb of Devakī to the womb of Rohiṇī. After this arrangement, I am personally going to appear in the womb of Devakī with My full potencies. Then I shall appear as the son of Devakī and Vasudeva. And you shall appear as the daughter of Nanda and Yaśodā in Vṛndāvana.
"Since you will appear as My contemporary sister, and since you will quickly satisfy desires for sense gratification, people within the world will worship you with all kinds of valuable presentations: incense, candles, flowers and offerings of sacrifice. People who are after materialistic perfection will worship you under the different forms of your expansions, which will be named Durgā, Bhadrakālī, Vijayā, Vaiṣṇavī, Kumudā, Caṇḍikā, Kṛṣṇā, Mādhavī, Kanyakā, Māyā, Nārāyaṇī, Īśānī, Śāradā and Ambikā."