A) Executive Director is one who devotes his whole time of working hours to the company and has a significant interest in the company as his source of income.
B) Non Executive Director does not dedicate his whole time in the day to day functions of the Company. Only attends Board Meetings and guide the company in its policy matters.
C) Additional Director is a director who is appointed at any time between two Annual General Meeting of the Company. Such additional director need to be confirmed as director in next coming AGM.