Agent

The definition of a software agent is according to Wikipedia simply the following: software agent is used in computer science to refer to pieces of autonomous, or semi-autonomous proactive and reactive, computer software, see [1]. Russell and Norvig say that an individual agent is just something that perceives and acts. Jürgen Lind says more precisely in his book "Iterative Software Engineering for multiagent systems" (Springer, 2001): an agent is a software system that is situated in an environment and that operates in a continuous perceive-reason-act cycle.