1) A passport is required for international travel as it establishes a person's identity and citizenship. Without a valid passport, one cannot enter another country.
2) Applying for an Indian passport online involves registering on the passport Seva website and filling out the application form with accurate personal details.
3) The process includes selecting a Passport Seva Kendra location, paying online, booking an appointment, printing the application receipt, and visiting the Kendra with required documents for police verification and passport issuance.