The channels of communications which follows the chain of command and considered as official are known as Formal communication channels.
A formal communication channel refers to the channel through which boards, managers, employees transmits various information such as the goals, policies and procedures within the organization.
An example of a formal communication channel in a company is its Mission & Vision Statement which gives the employees a clear idea of the company's goals and vision.
In conclusion, the channels of communications is known as Formal communication channels.
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