Forgery is a white-collar crime that generally refers to the false making or material alteration of a legal instrument with the specific intent to defraud. Tampering with a certain legal instrument may be forbidden by law in some jurisdictions but such an offense is not related to forgery unless the tampered legal instrument was actually used in the course of the crime to defraud another person or entity. Copies, studio replicas, and reproductions are not considered forgeries, though they may later become forgeries through knowing and willful misrepresentations.

जालसाजी एक एसा अपराध है जिसमे किसी अन्य व्यक्ति या संस्था छलना के प्रयास के साथ एक लेखन में फेरबदल किया जाए। जालसाजी के लक्ष्य कृत्रिम रूप से एक दस्तावेज है जो कानूनी वास्तविकता में परिवर्तन करने के लिए है।