The communication which happens outside the realm of interpersonal communication is called 

Mass communication is the process of messages to the masses. 

Key Points

• Mass communication is the process of conveying a message to a large group of anonymous and heterogeneous people. 
•  A huge group of anonymous and diverse people might be thought of as either the general public or a part of the general public. 
• Examples of mass communication channels, Broadcast television, radio, social media, print, etc.
• The message is usually provided by a professional communicator who frequently represents an organization.
• In contrast to interpersonal communication, mass communication feedback is typically delayed and indirect.

Therefore, The communication which happens outside the realm of interpersonal communication is called Mass communication.

Additional Information

• Intrapersonal communication refers to how we communicate with our inner selves. 
• Upward communication is defined as a communication process in which a message is transferred in the hierarchy. 
• Interpersonal communication refers to when the exchange of messages between two individuals.