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Answer:

There are around 8 million postal workers overall (including private and informal services, and parts of courier services). Communication services – using telephones, radio and microwave communications, as well as fibre optics, satellites and the Internet – play a crucial role in the world economy.

Explanation:

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Interdepartmental communication is the process through which various departments send and receive messages between themselves.

Intradepartmental Communication is a process through which the messages send and receive within the department.