[€uroMeinke]

There are lots of ISO standards, but usually when people talk ISO certified they are referring to the ISO 9000 series which is a quality standard for primarily manufacturing companies. Often companies will require that their suppliers be ISO 9000 certified as a way of ensuring that their products are built with quality standards. Of course the reality of ISO 9000 is it's a process of documenting and tracking quality - so you can still make crap products and be ISO 9000 certified as long as you document everything properly.