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The actor model is a computer science concept that uses "actors" as the fundamental agents of computing. Actors take input, send output and perform functions. They can also create other actors. This type of model was involved in early packet switching, and, as a semantic model, it has helped to evolve different kinds of software programs.
An "actor" is the fundamental idea in the actor model. Experts refer to an actor as a computational entity, but a more detailed explanation would be that an actor, like an object, is simply an instance of a particular class. This shows a similarity between the actor model and the object-oriented model.
In terms of its popular use, the actor model has a lot of similarities to the object-oriented model that is much more prevalent in many areas of computer science. Whereas an actor or a virtual agent implies more proactive functions, an object is endowed with properties and values that allow it to function in particular ways. This may be what led to the object-oriented model to thrive and kept the actor model from being dominant in the computer science field. Other experts point out that the actor model lacks a particular system for inheritance or hierarchy, and that problems with things like asynchronous message passing can affect systems negatively.