Hallway conversations, emails, and phone calls with your team members is an Informal Communication.
Informal communication is the casual exchange of information among coworkers. It is informal in character and is built on the social connections made at work outside of the traditional hierarchical organizational framework.
There are two types of internal communication: formal and informal. Official channels outlined in the organizational chart are used for formal communication. While informal communication moves more quickly and freely throughout the organization, discussing a wide variety of issues. Oral or written communications are both acceptable.
Hence, Hallway conversations, emails, and phone calls with your team members is an Informal Communication.
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