An online school in India that follows unschooling principles, as per the National Institute of Open Schooling (NIOS), is an educational platform that provides flexible and self-directed learning opportunities to school dropout or illiterate youngsters.

Characteristics of Online Schools in India for Unschooling:

1. Self-directed learning: Students take ownership of their learning, with minimal external structure or curriculum.
2. Flexible pacing: Students learn at their own pace, without age-based grade levels or rigid schedules.
3. Interest-led learning: Students explore topics and subjects that interest them, without forced curriculum or standardized testing.
4. Online resources and support: Students have access to online resources, mentors, and peer communities for support and guidance.

NIOS Guidelines for Unschooling:

1. Age range: 14-30 years for secondary and senior secondary courses.
2. No formal qualifications: No prior formal education or qualifications required for admission.
3. Self-study materials: NIOS provides self-study materials, including textbooks, workbooks, and online resources.
4. Personal contact programs: Regular personal contact programs (PCPs) with NIOS-accredited institutions for guidance and support.

Online Schools in India for Unschooling:

1. NIOS Online: NIOS offers online courses and programs for school dropout or illiterate youngsters.
2. SWAYAM: A government-funded online platform that offers courses and programs for unschooling students.
3. Khan Academy India: A non-profit online platform that offers free courses and resources for unschooling students.
4. Aarohi Life Education: A self-directed learning platform that offers online courses and programs for unschooling students.
5. The Learning Community: A self-directed learning community that offers online courses and programs for unschooling students.

These online schools and platforms provide opportunities for school dropout or illiterate youngsters to access education and learn at their own pace, following unschooling principles as per NIOS guidelines.