Lord Ayyappa, also known as Ayyappan or Sastha, is a revered Hindu deity widely worshiped in the South Indian states of Kerala, Tamil Nadu, Karnataka, and parts of Andhra Pradesh. He is considered to be the son of Lord Shiva and Mohini, an avatar of Lord Vishnu.

Key aspects and significance of Lord Ayyappa:

1. Birth and Legend: According to Hindu mythology, Lord Ayyappa was born from the union of Lord Shiva and Mohini during the churning of the cosmic ocean, known as the “Samudra Manthan.” He is believed to have been born to defeat the demoness Mahishi, who had received a boon that only a child born of Shiva and Vishnu could kill her.
2. Sabarimala Temple: Lord Ayyappa is the presiding deity of the Sabarimala Temple in Kerala, which is one of the most famous pilgrimage destinations in India. The temple is situated on the hilltop of Sabarimala in the Western Ghats and is open to devotees during specific periods, mainly during the Mandalam-Makaravilakku season (November to January).
3. Vratham and Pilgrimage: Devotees who wish to visit the Sabarimala Temple observe a 41-day vow or “vratham” before undertaking the pilgrimage. During this period, they maintain strict austerity and follow specific rules, including abstaining from non-vegetarian food, alcohol, tobacco, and other worldly pleasures.
4. A Symbol of Unity: The Sabarimala pilgrimage is known for its inclusivity and the spirit of communal harmony. Devotees from all walks of life, regardless of caste, creed, or religion, visit the temple seeking Lord Ayyappa’s blessings, making it a symbol of unity and devotion.
5. Makaravilakku: The Makaravilakku festival, celebrated on January 14th, is a significant event at the Sabarimala Temple. On this day, a celestial light, known as the “Makara Jyoti,” is believed to appear on the horizon of the Ponnambalamedu hill, and devotees consider witnessing this divine light as a blessed experience.
6. Symbolism: Lord Ayyappa is often depicted as a young celibate ascetic with a bow and arrow in his hand. The bow represents “dharma” (righteousness), and the arrow symbolizes the destruction of evil forces. His appearance embodies virtues such as self-control, courage, and compassion.
7. Other Temples: Apart from Sabarimala, Lord Ayyappa is worshiped in various other temples across South India. Temples dedicated to Lord Ayyappa can be found in Tamil Nadu, Karnataka, and Andhra Pradesh, each having its own unique traditions and practices.

Lord Ayyappa holds a special place in the hearts of his devotees, who undertake the challenging pilgrimage to Sabarimala with unwavering faith and devotion. The worship of Lord Ayyappa represents the pursuit of spiritual growth, self-discipline, and adherence to the principles of righteousness in Hindu tradition.