What is a Role Playing Game?

The game evolves in sessions, a session is a normal game, during which the various players are INTEREG their characters according to the provisions of the "Master", a kind of arbitrator, who shall decide how the story of various characters can go ahead deciding the fortune or misfortune.
A player participating in the various lots is lived as if your character becoming part of a fantasy world I live by elves and fairies, wizards and warriors, monsters and treasures. The player would say "roles" or spread, is interacting, living your character, then that's the name of "role play".
Usually these games are made between groups of friends on a table with pieces of paper, pencils and dice manual for the rules at hand and the various sessions can last more than a few hours.
It could take hours to explain what a role play, its nature and implications that this characteristic but not this in the place nor the time to do so.