In regards to the definition of personality, the above posts have clearly defined it. As for the aspects of masks, I would say that people do wear different "hats." Not that people do not wear masks, because they do, but not all people don masks to hide. Hats, on the other hand,can be worn to define a specific personality for the atmosphere. As a teacher, parent, spouse, and daughter, the hats I wear differ. Not that my personality changes much, but in some circumstances, my personality differs based upon the atmosphere. For example, when I walk into a classroom, I genuinely care about my students. Sometimes, by showing that I care, some students may tend to take advantage of my empathy. Therefore, I tend to hide the extent to which I care because I can not turn off my caring completely. Instead, the "hat" tends to cover up a little of my caring.