Answer

In Jain Dharma:

• Chauvihar / Chavihar means giving up all food and all liquids after a fixed time, usually after sunset.
• Tivihar means giving up food and most drinks, but allowing boiled water during the permitted time period.

Explanation

Chauvihar is a stricter practice. After taking the vow, one does not consume:

• Food
• Water
• Milk
• Tea
• Juice
• Any liquid

Tivihar is slightly less strict. In Tivihar, one gives up food and many types of liquids, but may drink properly boiled water according to Jain rules and within the allowed time.

These practices are commonly observed:

• Daily after sunset by many Jains
• During Paryushan
• During Ayambil, Upvas, and other tapasya
• Before sleeping, as a discipline of restraint

Spiritual Understanding

Chauvihar and Tivihar are connected with sanyam — self-control. They help reduce attachment to taste, comfort, and bodily habits.

In Jain Dharma, eating at night is avoided because it can cause harm to tiny living beings and increases carelessness. By practicing Chauvihar or Tivihar, one becomes more mindful, disciplined, and compassionate.

Takeaway

Chauvihar is complete abstinence from food and drink after the vow. Tivihar allows boiled water, while avoiding food and other drinks.