communication
Formal communication is also known by the name of official communication. Informal Communication is also known by the name of grapevine.
In formal communication the information must follow a chain of command. Conversely, the informal communication can move freely in any direction.
In formal communication full secrecy is maintained, but in the case of informal communication maintenance of secrecy is a very tough task.
Formal communication is generally written, whereas Informal communication is oral.
Formal communication is time consuming as opposed to Informal communication, which is rapid and quick.
Formal communication is more reliable than Informal communication.
Formal communication is designed by the organization. Informal communication starts itself due to the urge of ‘human to talk’.
In formal communication the documentary evidences are always available. On the other hand, in the case of informal communication the documentary evidences are not available.