User Profiles Are Important In Many Areas In Which It Is Essential to Obtain Knowledge About Users of Software Applications. Knowledge About a User Includes His Likes, Dislikes, Even His Emotional State Can Be Determined By User Profiling. In This Paper We Examine What Information Constitutes a User Profile; and How the Profile Information Is Used to Get the Emotional State of a User. We Also Study the Main Issues Regarding User Profiles from the Perspectives of These Research Fields.