system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what's the purpose of electronically signing on a credit purchase especially when most signatures are not the person's actual signature or lazy scribble that doesn't resemble letters and In what ways are they used?
gpt
There is zero security in a signature. No one checks them, and only a very few are able to detect what is a genuine signature and what isn't.

The best they can do is provide evidence if the holder of a card who did a transaction tries to charge it back. Then the recording of the signature can be verified by real experts, or, more importantly, video of them signing for the transaction produced in court to support a fraud charge. Similarly, the record of a fraudulent signature will be an extra fraud charge if they catch someone who uses someone else's card.