what are those random characters at the bottom of the bio page of a passport?
In: 1
That is the [Machine-Readable Passport](https://en.wikipedia.org/wiki/Machine-readable_passport). It’s just a way of efficiently encoding information on and about the passport in way that’s easy to scan and a computer can rehydrate it all later to help automate security screenings or make sure nothing on the passport has been altered after-the-fact.
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