What type of communication does an intercom system primarily facilitate?

An intercom system is primarily designed to facilitate two-way communication between individuals in different locations. This system allows users to talk to each other directly, enabling a dialogue rather than just sending information one way. It is commonly used in residential, commercial, and security applications to allow for communication between people in separate rooms or areas.

While some intercom systems might also have features that support one-way notifications or visual alerts, the fundamental purpose and primary function of an intercom is to create a direct conversation link between users, aligning with what is meant by two-way communication. Thus, the correct choice highlights the essence of intercom technology in practical use.