Answer

Trivihar Upvaas is a Jain fast in which a person does not eat any food for the whole day, but may take boiled water during the permitted daytime period.

Explanation

In Jain practice:

• Upvaas means fasting for one full day.
• Trivihar means giving up three types of intake:

• Food
• Raw water
• Other drinks or liquids

However, in Trivihar Upvaas, one may drink boiled water, usually only during the allowed time after sunrise and before sunset, according to Jain discipline.

It is different from Chauvihar Upvaas, where even water is completely avoided.

Spiritual Understanding

Trivihar Upvaas is practiced for:

• Self-control
• Reduction of attachment to taste and food
• Purification of thoughts and conduct
• Spiritual discipline and tapasya

The purpose is not only to avoid food, but to stay peaceful, avoid anger, do prayer, samayik, pratikraman, svadhyay, and maintain pure feelings.

Takeaway

Trivihar Upvaas means fasting without food, while allowing boiled water during the proper time. It is a respected Jain tapasya practiced with discipline, purity, and spiritual awareness.