When it comes to Personality actors, are those who are so effective in a certain type of role that they portray that they often end up playing variations of it in film after film. This is what happened to Clint Eastwood in his Dirty Harry Films and Keanu Reeves in his Bill and Ted Adventure series. Once an actor personifies the role he is playing, he becomes a typecasted personality actor. Other examples of Personality actors are Jennifer Aniston, who seems to be stuck playing the girl next door characters in her films, and Sarah Jessica Parker whose Carrie Bradshaw character in the Sex and the City series and films appear to be hired to portray only that type of character ever since. With personality actors such as the two other examples I mentioned, the audience no longer knows the characters name but sees the role being played as the actor himself, in person. That is the mark of an effective Personality actor.
Stars, on the other hand, are the likes of Angelina Jolie and Brad Pitt. Reese Witherspoon, Anne Hathaway, Hugh Jackman, George Clooney, are other names that pop up when a star is mentioned. These are the people whose box office draw is such that people have taken a keen interest in their lives and that the mere mention of their attachment to a project can generate such buzz that people want to see the movie even before the film is shot. That is what defines a star, they are people who effectively hold the interest of the viewers over time and their career progressions.