Why do visa applications require birth certificate? [closed]

It seems for quite some countries (e.g. Japan, Austria), getting a long-term visa (e.g. work visa) requires submitting one's birth certificate.

What information do immigration departments require from a birth certificate that isn't available from a passport?

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What will prevent you from getting a visa?

In addition to restrictions on the number of visas issued, certain situations can disqualify your family member from obtaining a visa....These crimes include:

Drug trafficking;
Prostitution;
Human trafficking, including sex trafficking;
Murder;
Manslaughter;
Sex crimes;
Spousal abuse;
Child abuse; and.

What are the mandatory documents for any visa application?

Information to be Provided with Visa Application Form

Name of the applicant.
Date of birth.
Passport number.
Profession.
Dates of travel/stay at your destination country.
Contact address in the destination country.

Is birth certificate mandatory for Canada visa?

You need to attach photocopies of identity and civil status documents with your Canada visa application. This includes birth certificates, marriage certificates, or divorce/annulment certificates. In some cases, you may be required to provide National IDs or family or household registries.

Why would a visa application be rejected?

An applicant's current and/or past actions, such as drug or criminal activities, as examples, may make the applicant ineligible for a visa. If denied a visa, in most cases the applicant is notified of the section of law which applies.

Clarification around Birth Certificate required for Visa Application

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