Considering the developments in robotics, the definition of the notion "robot" can change over time. Information technologies (hereinafter IT), more particularly cloud computing, had a great impact on social robotics. Socially assistive robotics (hereinafter SAR) has many aspects, but the major one is human-robot interaction (hereinafter HRI), where the 'H' stands for user studies that means the human perspective; the 'R' represents the technological and other characteristics of the robot. Gaining insights into the 'I' (the nature of interaction between humans and robots) is possible only by investigating both 'H' and 'R'. Considering this, we can formulate the key challenge of HRI as follows [1]:"HRI is the science of studying people's behavior and attitudes towards robots in relationship to the physical, technological and interactive features of the robots, with the goal to develop robots that facilitate the emergence of human-robot interaction that are at the same time efficient (according to the original requirements of their envisaged area of use), but are also acceptable to people, and meet the social and emotional needs of their individual users as well as respecting human values".
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