Communication may be classified into several categories on the following basis:
1.On the Basis of Organizational Structure or Relationship:
- Formal Communication
- Informal Communication or Grapevine.
2.On the Basis of Flow or Direction:
- Downward Communication
- Upward Communication
- Horizontal or Lateral or Sideward Communication
- Diagonal Communication.
3.On the Basis of Methods or Media used or Expression:
- Written Communication
- Oral Communication
- Gestural or Non-Verbal Communication.