RFID duplicate card, is it possible?

Question

RFID

Inside the card, this winding is visible through the light, is it possible to somehow duplicate it by reading the "magnetic field" from it, i.e. just duplicate cards with aliexpress on a blank or is it IMPOSSIBLE?

Answer 1

https://habr.com/post/161401/
RFID is different from RFID.
There are simple ones. A number is written there, a string - that is, a simple code. This can be duplicated.
And there is a built-in encryption chip. These are not possible.