Answer

In Jainism, “tithi” means a lunar date, not a sect. So there are no standard Jain sects called “1 tithi” or “2 tithi”.

If you are referring to tithi-based observance, then:

• 1 tithi means following an observance on one lunar date
• 2 tithi means following an observance on two lunar dates

Explanation

Jain sects are usually described as:

• Digambara
• Śvetāmbara
• and their further branches or traditions

But 1 tithi and 2 tithi are not common names for sects in Jain Dharma.

If someone is using these words in a local or regional context, they may be referring to:

• fasting rules
• temple observance dates
• or calendar-based religious practice

Spiritual Understanding

In Jain tradition, the focus is not on naming sects by tithi, but on:

• right conduct
• discipline
• austerity
• devotion
• and non-violence

Takeaway

So, the main difference is:

• 1 tithi / 2 tithi = usually date-based observance
• not recognized as Jain sect names

If you meant a specific Jain practice or community usage, I can explain that clearly too.