A Bitcoin paper wallet contains a pair keys: public key (address used to receive coins) and private key (allows to spend coins stored at that address).
Those keys are printed in a form of
QR-codes so that everybody can quickly scan them and add the keys to a software wallet to make a transaction.
Now, if I lose my Bitcoin paper wallet, someone who finds it, is he able to spend my coins by scanning QR-codes ? And if yes, is this type of wallet secure ?