Puja
A Puja is a ritual designed for an individual person to worship Jineshwars. The presence of a holy idol provides mental focus. It provides peace and harmony and encourages one to detach oneself from the desires of everyday life. It allows all lay people to have access to Jineshwar and what Jain principles stand for.
The idol provides us means to pray and offer reverence and utmost admiration. The puja consists of mainly worshiping Jineshwar’s idols, first with offering physical items such as water, flowers,rice, sweets and fruits, and secondly, devotionally singing praises of the Jineshwar and commitment to follow his path.
In jain scriptures (Shree Dharma Sangrah, Shree Puja - Panchashakaji etc.), it has been documented that worshiping idols with physical and mental offerings is a form of expressingdevotion with utmost reverence to the path illuminator and the path itself.
Vidhana
Vidhana means set of instructions to be followed. Vidhana or aaradhana is performed based on special bhijakshar mantras customised from Acharya for achieving perticular sperituale levels.
Vidhana is big ritual, that can last feom single day to couple of days… a Special form of puja is termed as Vidhana. In another words, Mahapujan is equivalent to Vidhana, like Shanti Vidhana, Dhai Dweep Vidhana, Shri Siddhchakra Vidhana, Rishimandal Vidhana, 24 Tirthankar Vidhana, etc.