ChatBot can be described as software that can chat with people using artificial intelligence. The use of chatbots evolved rapidly in numerous fields in recent years, including Marketing, Supporting Systems, Education, Health Care, Cultural Heritage, and Entertainment. In this paper I first present the overview of chatbots. Next we discuss the need of chatbots and virtual assistants and its usefulness in a variety of areas. We also clarify the necessary technological concepts. Then we move on to

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... classification of chatbots based on various criteria, such as the area of knowledge they refer to, the need they serve and others. Furthermore I present the general architecture of modern chatbots.