Utilized in a number of applications, the chatterbot is intimately involved with online gaming and other programs where the actions and verbal communications of a human being impact the responses made by the computer program. (EasyTechJunkie)

An untrained instance of ChatterBot starts off with no knowledge of how to communicate. Each time a user enters a statement, the library saves the text that they entered and the text that the statement was in response to. As ChatterBot receives more input the number of responses that it can reply and the accuracy of each response in relation to the input statement increase. (PythonRepo)

The basic idea states that chatterbots render computers more human-like, engaging and motivating. Users do not need to click, drag and drop or open menu. They can directly communicate applying their natural skills. Hence, social agents are expected to support many cognitive functions of the user, such as problem solving, learning and understanding. (ResearchGate)