What is formal and informal organization? What do you understand by span of control?

What is formal and informal organization?

Formal organization: It is the intentional structure of roles in formally organized enterprises.

Informal organization: It is a network of interpersonal relationship that arise when people associate with others.

What do you understand by span of control?

The number of employee who can be effectively and efficiently supervised by a manager.
The exact number will depend upon the number of underlying.
Narrow span: Few persons reporting to manager. Here manager spend great deal of time with subordinates.

Wide Span: Many persons report to the manager. Here manager spend very less time with managers.