28b3984c_mal_and_Informal_Communication__Informal_communication
[SL] 1 5 [Points of Difference] Spontaneous [Formal communication] Here messages flow along the formal channel, which is rigid Therefore, employees have to be conservative. [Informal communication] 
There is no boss-subordinate relationship in such communication. So everybody can frankly and freely communicate his view or feeling.
Difference Between Formal and Informal Communication
Informal communication