Stainless steels are finding extremely wide application in various industrial sectors today, especially in those where materials are exposed to extreme conditions such as the oil industry, naval architecture or construction. Despite their advantages, durability and good mechanical properties, they also have drawbacks such as high cost and requirements for special processing. Additionally, when using corrosionresistant steel elements, damages are not excluded. Although they are called stainless, there is still a possibility of corrosion in highly aggressive environments, so regular maintenance is necessary. In this work, based on theoretical facts, the classification of corrosion processes, stainless steels, their classification, and alloying and the purpose of alloying have been discussed. Subsequently, corrosion-resistant steel groups, their microstructures, properties, and applications have been described in more detail, followed by a conclusion on the topic.