The Indian numbering system is used in India, Bangladesh, Nepal, and Pakistan. It is based on the Vedic numbering system and uses lakh (100,000) and crore (10,000,000) as units for large numbers. The system places commas every two digits after the hundreds place rather than every three digits. It is used in various South Asian languages like Hindi, Bengali, Punjabi, and others, with some variations in the names used for lakh and crore across languages.