Goddess Kali holds the primary position among all the ten great learnings. There is a tale mentioned in the Kalika-Purana. Once the deities went to the Himalayas and eulogised the personifications of the illusions of the world (Mahamaya). According to the Purana this place was the hermitage of Sage Matang. Pleased by them, Bhagavati appeared in the form of Matang's mistress and asked as to whom were they eulogizing.
Instantly a divine appearance manifested from the body of that mistress, which was as dark as a Mountain in complexion. This divine appearance herself answered on behalf of the deities that these deities are eulogizing me.

Since the complexion of that divine appearance was black like a collyrium she was given the name of KALI.

The worship of Kali requires proper initiation by Guru. Goddess Kali is pleased by chanting mantras, doing worship and a sacrifice or burnt offering etc. either on the image, or by the help of Yantras (mystical diagrams) or by any other way shown by an able teacher (Guru).

If goddess Kali is pleased then all the aspirations of man gets fulfilled and he is saved from the dangerous calamities.

Worship - Normally, wishes and aspirations get fulfilled if either the cryptic mantra or the other mantra are chanted for 1,25,000 times (one lac and twenty five thousand), with full faith and devotion. The chanting of the mantras can be raised according to the requirement.

Before chanting the mantras the Kali Yantra should be properly worshipped.