Forged documents are fabricated or altered records presented as genuine. They exploit a deep-seated heuristic: official-looking paperwork carries authority, and we routinely accept documents as standing in for facts we can’t check ourselves. A convincing invoice, certificate, bank statement, ID, or approval borrows the credibility of the format — letting a fabrication clear an obstacle that honest evidence never could.
The mechanism is authority-by-artifact plus trust in institutions. We don’t independently verify most documents because doing so is costly and, most of the time, unnecessary — which is exactly the gap forgery targets. Detection often comes down to inconsistencies (mismatched dates, fonts, totals, seals), an issuer who can’t be reached or has no record, and a supplier who offers only copies and pushes for quick acceptance. Digital forgery has lowered the skill barrier, so a polished appearance now proves even less than it once did.
Because a document is only as trustworthy as its source, the defense is to verify at the source rather than to judge the paper. Contact the issuing authority through details you look up independently, inspect originals and provenance, cross-check against known-genuine samples, and refuse to act under time pressure. A real record confirms cleanly on an independent check; a forgery depends entirely on that check never being made.