She was believed and worshipped by the ancient Tamils to bring rain and hence prosperity to them as their vegetation was mainly dependent upon rain. The word Mari (pronunciation: /maari/) has a sangam Tamil origin meaning 'Rain' and the Tamil word Amman means 'Mother'. In the post-vedic period, Māri was associated to Hindu goddesses like Parvati, Kali and Durga as well as with her North Indian counterpart Shitaladevi and Eastern Indian counterpart Manasa. She is the main Tamil mother goddess, predominant in the rural areas of Tamil Nadu. Mariamman is an Tamil folk goddess, whose worship probably originated in pre-vedic India. She is usually taken in procession in a decorated chariot. According to shaktha agamas, she is depicted in sitting posture and might be flanked some times by Ganesha and Subramaniya or Ganesha and Naaga on her sides. She is worshipped in accordance to the local agamas as ' Pidari' or the 'Grama Devata' usually by non- Brahmin priests or in some cases of big temples like Samayapuram Maariamman temple, also by Brahmin priests. Her worship mainly focuses on bringing rains and curing diseases like cholera, smallpox, and chicken pox. Throughout the Tamil Nadu and deccan region, grand festival known as 'Aadi Thiruvizha' are taken for Maariamman. Festivities for her happen during the late summer, early autumn season of 'Aadi'. It is said that when Kali went to Southern India as Mariamman, Bhairava followed her as Madurai Veeran. Goddess Mariamman is considered by many to be the South Indian Incarnation of Goodess Kali.

She is the main South Indian mother goddess, predominant in the rural areas of Tamil Nadu, Thirucherai Māri is closely associated with the Hindu goddesses Parvati and Durga as well as with her North Indian counterpart Shitaladevi. Māri (/mɒrı/, /maari/, Tamil: மாரி), also known as Mariamman ( /mɒrı əˈmʌn/ Tamil: மாரியம்மன்) and Mariaai (Marathi: मरी आई), both meaning 'Mother Mari', spelt also Maariamma (Tamil: மாரியம்மா), or simply Amman or Aatha (Tamil: அம்மன், 'mother') is the South Indian Hindu goddess of rain.

Mariamman moola mantra in tamil