Kali is the angelic protector of the earth, she is also known as Kaalika the Hindu goddess. According to the Vedic scriptures she is called as the “Dark Mother” because of her destructive power.
Kali is the name derived from the Sanskrit word “Kaal” which means time. She, therefore constitute time, power, protection and destruction. She is considered to be the fierce form of Durga/Parvati who is the companion of lord Shiva.
She is pictured as the giver who gives liberation and destroys all the evil forces.
In most of the conversation she is depicted as fierce and evil but she is the mother of the world and filled with sympathy. She is contemplating primitive form of life beginning.
Maa Kali is considered to be the first of 10 Mahavidhyas, or demonstration of Great Goddess or the supreme reality.
She is often seen as standing or dancing on her companion, the Hindu God Shiva who lies there quiet and flat.
Kali mantras are usually being chanted during the Ashtami of Navratri and for its higher effect you can chant these mantras in the Gupt Navratri.
Mantras have a huge effect during these periods and one can attain Siddhi over these chants.