Answer

If you mean Ashwin Navpad Oli, it is a very important Jain observance of nine days that comes twice a year—once in the spring (Chaitra) and once in the autumn (Ashwin/Aso). It is also called Āyambil Oli or Navpad Oli. During this period, Jains worship the nine supreme spiritual entities and many observe the āyambil fast, eating one very simple, tasteless meal a day. ( jainpedia.org)

Explanation

The word Navpad means nine sacred posts or states. These are:

• Arihants
• Siddhas
• Acharyas
• Upadhyayas
• Sadhus / Sadhvis
• Samyak Darshan
• Samyak Gyan
• Samyak Charitra
• Samyak Tap ( yja.org)

Traditionally, the festival is closely connected with:

• Siddhachakra / Navapada worship
• Navkar Mantra recitation
• Temple worship and sermons
• Reading or hearing the story of Śrīpāl and Mayṇāsundarī ( jainpedia.org)

How Jains celebrate it commonly includes:

• Observing āyambil: one plain meal a day, with very simple food
• Avoiding rich or taste-enhancing items such as oily, spicy, sweet, or heavy foods
• Worshipping the Siddhachakra/Navpad yantra
• Listening to religious discourses
• Doing prayer, confession, and spiritual study
• In some traditions, following the fast for all nine days, and in some cases repeating the nine-day cycle over a longer period ( jainpedia.org)

Spiritual Understanding

Navpad Oli is important because it reminds Jains to honor the path of liberation. It is not only about fasting; it is about:

• reducing attachment to taste and comfort
• increasing self-discipline
• remembering the nine worthy ideals of Jain Dharma
• deepening devotion to the Navkar Mantra and the Siddhachakra ( jainpedia.org)

In many Jain traditions, this observance is also linked with marital well-being, family harmony, and spiritual upliftment, especially through the story of Śrīpāl and Mayṇāsundarī. ( jainpedia.org)

Takeaway

In simple words, Ashwin Navpad Oli is a Jain festival of devotion, austerity, and inner purification. Jains celebrate it by worshipping the nine sacred principles, doing āyambil, and focusing on spiritual growth rather than sense enjoyment. ( jainpedia.org)

If you want, I can also explain the 9 Navpad in simple meaning or give you a day-by-day Navpad Oli worship guide.