International travel electric question..

Okay, so I've done some basic research on international adaptors and several that I've found make the additional warning that they are only adaptors, not converters.

Given that I'll have a lot of necessary electronics with me (computer, digital camera, iphone), I'd rather be safe than sorry.

Anyone have any recommendations on converters that I should buy? Or is it really just not that necessary anymore? If the info is needed, I'll be in Spain. Thanks!