The Human Development Index (HDI) is a measure of a country's overall well-being based on three dimensions - health, education, and standard of living. The impact of HDI on the welfare of Particularly Vulnerable Tribal Groups (PVTG) population in India can be significant.

• Health: HDI can have a positive impact on PVTG population's health by providing better access to healthcare facilities, reducing mortality rates, and improving the nutritional status of the population.
• Education: HDI can help PVTG population to gain knowledge and skills, leading to better employment opportunities, increased income, and improved living standards.
• Standard of Living: A higher HDI can help to reduce poverty, provide basic amenities, and improve the overall quality of life for the PVTG population.

The significance of HDI for the 28 lakh PVTG population in India is that it can help to improve their socio-economic status, reduce inequalities, and promote inclusivity. As PVTG population often faces social exclusion, discrimination, and marginalization, a higher HDI can help to level the playing field, and provide them with equal opportunities for development and growth. Therefore, investing in improving HDI can lead to a brighter future for PVTG population in India.