Signed transactions depend on the bank; it means the card only supports SEPA Debit, so the supermarket has to manually debit your account later, that's what you

Signed transactions depend on the bank; it means the card only supports SEPA Debit, so the supermarket has to manually debit your account later, that's what you sign for. Modern cards (anything that supports EC) can handle using only chip+pin or contactless.