system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are signatures still relevant, if they can easily be forged?

Even in movies, you often see the bad guys trying to get a real signature from the good guys. Why cant they just be forged?
gpt
The strength of most signatures is the act of signing with a witness.  The scribbles on the paper are just a physical way to note the act.  

For example, signing the pad at the store for credit card purchase.   The strength of the signature lies in the security camera footage of your face doing the signing.  

In many legal documents where the strength needs to be increased, a third party notary is used where another neutralr person attests to your identity (by you providing gov ID card of some sort) and the signature act.