In Hinduism, Kaumari Matrika is revered as one of the Sapta Matrika, the seven divine mothers. Goddess Kaumari is the divine feminine power of Lord Kartikeya. Lord Kartikeya is also known as Kumara Kartikeya. Therefore, His feminine power is known in the three worlds as Kaumari. The worship of Goddess Kaumari blesses Her devotees with fearlessness and grants victory in every battle of life.
Goddess Kaumari resides under Udumbara Vriksha, i.e., cluster fig tree and She is the Adhishthatri Devi, the Chief Goddess of west direction. According to the Varaha Purana, Goddess Kaumari represents Bhrama, i.e., illusion and Moha, i.e., attachment. In Devi Purana, Mayapuri is described as the abode of Goddess Kaumari.

According to the Vamana Purana, Sapta Matrika originated from one another as embodiments of divine power. According to an account found in Vamana Purana, Sapta Matrika manifested to assist Goddess Ambika in Her quest to annihilate the demon Raktabeeja. When Raktabeeja, along with his demon army, arrived on the battlefield to wage war against the Goddess Ambika, at that precise time, Ambika let out a resounding war cry, which caused the emergence of Goddess Brahmani from Her divine mouth. From the eyebrows of Brahmani emerged Goddess Maheshvari and from the lion of Maheshvari manifested Kaumari Matrika while carrying a spear in Her hand and seated on a Mayura, i.e., peacock.
In Vishnudharmottara Purana, Goddess Kaumari is described as possessing six faces and twelve arms. All Her six faces have three eyes. The form and appearance of Goddess Kaumari are related to Lord Kartikeya, in fact closely resemble Him. Goddess Kaumari is shown mounted upon a peacock.
According to Purvakarnagama and Devi Purana, Goddess Kaumari has yellow complexion. She is portrayed donning blue garments while sitting on a peacock. On Her head, She adorns a Karanda Mukuta, a cone-shaped crown.
Moola Mantra -
ॐ कौमार्यै नमः।
Om Kaumaryai Namah।