Why are passports important for international travel and identification purposes?

Passports are important for international travel and identification purposes because they serve as official documents issued by a government to its citizens, verifying their identity and nationality. They are required for entry into foreign countries, ensuring that travelers are legally allowed to be in that country and facilitating border control and security measures. Passports also provide a standardized form of identification that is recognized worldwide, helping to prevent fraud and ensure the safety of travelers.