In case of Formal communication information transmitted transmitted though official chain of command. In the words of Thill and Bovee."in case of formal communication information may travel down,up and across and organaization's formal hierarchy."
S.P.Robbins said, "formal Communication are typically vertical,follow the authority chain and are limited to task related communication."
Thus it can be said that communication by using the formal official channel can be termed as formal communication.
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Some times formal communication is required in casual places...It is required who understands...