A passport is an official document issued by a country's government that authorizes its citizen to travel abroad and provides identity and citizenship verification. The main objectives of a passport are identification, establishing nationality, and safe travel. There are different types of passports including ordinary, official, diplomatic, and emergency passports. Indian citizens must provide proof of address, date of birth, and citizenship documents when applying for a passport. The application process involves filling forms, providing residency and identity proofs, and submitting the application at a passport office, district passport center, or speed post center along with applicable fees. Passports are then issued either through the passport office or via an online application process.