If you are travelling in Spain, long term maybe doing a working holiday or studying there then you may need a way to pay for things using a Spanish credit card or tarjetas Credito. It is worth taking a look into them before you go as you could find that you will be ableto get on much better if you use it rather than one from another country. Bigger stores, restaurants and hotels would probably not mind how you paid but for smaller places, they may be happier with something Spanish and so having a card from a Spanish bank could be really in your favour. It is worth taking a look into anyway and seeing whether you think it would benefit you when you are visiting Spain.