A paper wallet is private key(s) printed or written in a paper. Most times, private keys will be generated in an offline computer for making it super-secure and then printed. Printing via wifi is not secure.
P.S. You can use
https://www.bitaddress.org/ to create paper wallet. Don't do it online. Download webpage(.zip file) and then generate private keys from an offline computer and print it.
I see. Question, can i use mycelium to generate address and get the private key, write it on paper and delete the address and key from mycelium?