For over twenty years psychologists have been using information and communication technology to design solutions aimed at improving mental health and quality of life of their clients or patients. One of those solutions are internet interventions. Although these interventions are commonly used in other countries, knowledge about them in Poland is limited. The aim of the article is to introduce to the topic of psychological internet interventions by describing the basic functionalities of internet interventions, the context of their use, their classification, areas where they can be applied and challenges related to their future development and wider implementation.