For more serious cases, a signature will be required to be done in the presence of a third party like a notary public, who will witness the signing of the document and affirm that the person whose signature appears on the document was the person who actually signed it (and anything else that needs to be witnessed or affirmed.) But that can be extremely inconvenient, so for many purposes a signature that is ultimately only so trustworthy, is good enough. At the end of the day no manner of documentation is %100 trustworthy in all cases, but we have an adversarial legal system that allows people to dispute things, so if there is some disagreement about who agreed to what that recourse is always available to the parties
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