Siddhars are saints in India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

, mostly of the Saivaite denomination in Tamil Nadu

Tamil Nadu

Tamil Nadu is one of the 28 states of India. Its capital and largest city is Chennai. Tamil Nadu lies in the southernmost part of the Indian Peninsula and is bordered by the union territory of Pondicherry, and the states of Kerala, Karnataka, and Andhra Pradesh...

, who professed and practised an unorthodox type of Sadhana

Sadhana

Sādhanā literally "a means of accomplishing something" is ego-transcending spiritual practice. It includes a variety of disciplines in Hindu, Sikh , Buddhist and Muslim traditions that are followed in order to achieve various spiritual or ritual objectives.The historian N...

, or spiritual practice, to attain liberation. Yogic powers called Siddhi

Siddhi

is a Sanskrit noun that can be translated as "perfection", "accomplishment", "attainment", or "success". The term is first attested in the Mahabharata. In the Pancatantra, a siddhi may be any unusual skill or faculty or capability...

s are acquired by constant practice of certain yogic disciplines. Those who acquire these Siddhis are called Siddhas. These sidhars can be compared to Mystics

Mysticism

Mysticism is the knowledge of, and especially the personal experience of, states of consciousness, i.e. levels of being, beyond normal human perception, including experience and even communion with a supreme being.-Classical origins:...

 of the western civilization.
Siddhars are people who are believed to control and transcend the barriers of time and space by meditation (Yoga

Yoga

Yoga is a physical, mental, and spiritual discipline, originating in ancient India. The goal of yoga, or of the person practicing yoga, is the attainment of a state of perfect spiritual insight and tranquility while meditating on Supersoul...

), after the use of substances called Rasayanas that transform the body to make it potentially deathless, and a particular breathing-practice, a type of Pranayama

Pranayama

Pranayama is a Sanskrit word meaning "extension of the prana or breath" or more accurately, "extension of the life force". The word is composed of two Sanskrit words, Prāna, life force, or vital energy, particularly, the breath, and "āyāma", to extend, draw out, restrain, or...

.