An attention-seeking person who pretends to be someone else and gets paid a ridiculous amount of money for doing so.
This person is incapable of doing a real job because there would be no one clapping for them all the time.
Today's actors are descended from - and are no better than - the travelling bands of buffoons from centuries ago, who pretended to be other people and got paid next to nothing. They were considered to be the lowest of the low.
Today, thanks to television and cinema, these same buffoons get paid more money than all the worthwhile doctors, scientists etc. put together. In fact they get paid more money than possibly anyone else, with the result that all the gullible, foolish people consider them to be the highest of the high.
Red carpets are often rolled out for them to walk on in an effort to make them feel important.
They are always boasting about their "craft" and how they are so thankful to be paid for doing what they love.
Actors are always giving each other awards and they are under the delusion that anyone who is in "The business" is better than anyone who does a real job.
Essentially, an actor is a person who has at least one plastic surgery procedure per month, thinks that they are a cut above the rest, and gets paid too much. Despite never having done a day's work in their life.
Tom Cruise is a good example of an actor. This person has been in the spotlight a great deal and it has affected his brain.
Consequently, he believes himself to be an expert on every topic known to man, from religion to psychiatry.
This behaviour could also, possibly, be attributed to the fact that he is so used to pretending, that he doesn't know when to stop. That would explain why nobody believes that he knows anything at all about any of these topics.