Millions of people leave their homes each year for work, with many migrating from states like Bihar, Uttar Pradesh, Jharkhand, West Bengal, Assam, Chhattisgarh, and Madhya Pradesh to states with more opportunities like Maharashtra, Gujarat, and Surat. The construction sector employs the largest number of migrant workers at around 1.5 million, while other major employers include banking and finance (45-50 lakhs), auto (20-22 lakhs), health (40-45 lakhs), and retail (40-55 lakhs).