This type of communication channel is called informal channel.
Informal Channel of communication doesn't follow the laid rule or hierarchy of command. is also an official way of communicating, with somewhat relaxed norms. It is a casual exchange of information among coworkers. Informal communication channel is an unofficial and unstructured channel which is not prescribed by the organization but exists due to personal and social needs of people working in an organization.
Lunchtime is an example of informal communication channel because, the atmosphere during that time is relaxed and communication and discussion among workers are encouraged.
Single strand, gossip chain, probability chain and clusters are types of informal communication.
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