+ * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
+ * This is the only component in SimGrid that actually does something on its own, executing its own code.
+ * A resource will not get used if you don't schedule activities on them. This is the code of Actors that create and schedule these activities.
+ *
+ * An actor is located on a (simulated) host, but it can interact
+ * with the whole simulated platform.
+ *
+ * (back to the @ref s4u_api "S4U documentation")
+ *
+ * @section s4u_actor_def Defining an Actor
+ *
+ * The code of an actor (ie, the code that this actor will run when starting) the () operator.
+ * In this code, your actor can use the functions of the simgrid::s4u::this_actor namespace to interact with the world.
+ *