When I was younger, it was very difficult to sign a paper and send it back to someone. Just a few years ago, I had to print out the paper and sign it. Then I had to either make a copy of it and mail it through the US postal service to the place where it should go. Another way was to fax the paper to the place. Later, I could scan it in and email it to the person.
Now, I can sign my documents online without having to print or scan anything. I can do an electronic signature or sign it digitally. There is a difference between a digital signature and electronic signature. Electronic signature often contained a symbol that represented the person’s signature. A digital signature is much more authentic.