Vaishno Devi (also known as Mata Rani, Trikuta, Ambe and Vaishnavi) is a manifestation of the Hindu Mother Goddess, Devi in a popular folktale. The words "Maa" and "Mata" are commonly used in India for mother, and thus are often heavily used in connection with Vaishno Devi. Vaishnavi was formed from the combined energies of Kali, Lakshmi, and Saraswati.

According to the folktale, during the Treta Yuga (second yuga of Hindu cosmology), evil forces started to threaten the earth. To save herself, Bhumi the mother earth, went to the Trimurti for help. While the three gods were helpless, their consorts — Saraswati, Lakshmi and Parvati (Kali) combined their forces and created a goddess named Vaishnavi. After numerous battles, the goddess defeated evils and was ordered to stay on earth to protect it.

Years after, Vaishnavi was reborn as the daughter of a Brahmin couple. From childhood, the goddess was attracted to Vishnu and decided to marry him. When she grew up, she started to mediate in order to please Vishnu. One day, Rama, an incarnation of Vishnu, came to her. Rama refused to marry her and told that he is searching for his lost wife — Sita. Seeing his devotee in misery, Rama promised her that he will return one day and if she recognise him, then he will marry her. Years later, Rama as an old man came there, but she couldn't recognise him. As a result, Rama again promised her that he will marry her as Kalki, the last avatar of Vishnu.  Source : Wikipedia

Trasnport

By Road: Jammu and Kashmir State Road Transport Corporation buses operate to and from Jammu to Katra at regular intervals. Air-conditioned private deluxe buses and taxis are also available from Jammu to Katra.
By Train: The nearest railway station from Katra is the Udhampur railway station. Taxi and cab services are available from the railway station to Katra.
By Air: Located at a distance of 50 kilometres, the Jammu airport is the nearest to Katra. Jammu is well-connected with major airports in India. It’s easy to get a cab from the Jammu airport to Katra as regular taxi and cab services are available.