To put it as simply as possible, ISO certified means that a company has proven that it follows the standards developed by the International Organization of Standardization. So why isn’t it called IOS certified since it is developed by an organization with that acronym? That is due to the fact that it is an international standard, therefore in different languages it would have a different acronym, so they decided to simply name it “ISO” no matter what language it is in, because after all the standards are supposed to be the same for each country so it only makes sense that the name remains unchanged as well. It is also very close to a Greek word, isos, which means “equal”, another reason for the choice of acronym.
So anyway, an ISO certified company is one that complies with various international standards such as product quality, environmental friendliness, safety, reliability, and economical. These are all things that consumers look for, and often take for granted, when buying a product, but not all companies hold themselves up to such a standard.
That is why being an ISO certified company is such a big deal, it sends a clear message to consumers and other companies that the product being sold is worth buying. Products made by these companies are almost always more expensive, yet they usually have no problem at all competing with cheaper products, because those made by non-ISO certified companies often take shortcuts in production or quality control and don’t earn the same level of trust.