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Real-time communication (RTC) is exchanging information with almost no delay. Think of a live conversation, not mailing a letter and waiting for a reply.

RTC's defining trait is immediacy: data moves between people almost instantly. No noticeable lag, synchronized experiences, and a real sense of presence.

The split is about expecting instant feedback. Real-time means live chat, calls, and gaming; non-real-time means email or forums, where you wait minutes or hours.

RTC powers many of our favorite apps and unlocks new ways to interact. Without it, the digital tools we rely on simply wouldn't feel instant.

Video conferencing is classic RTC: your voice and video are sent and received instantly, so a remote call feels like being in the same room.

Online multiplayer games live or die on RTC. Players must see each other's moves and react in milliseconds for fair, immersive play.

Collaborative tools lean on RTC too - shared docs updating as people type, live screen sharing, and interactive whiteboards for brainstorming together.

RTC usually means low latency, high throughput, two-way data flow, and full interactivity - so users can respond and shape the conversation instantly.

Under the hood, RTC seeks the quickest path - direct peer links or fast relays instead of routing through many servers. Special protocols make this speed possible.

Recap: RTC is the immediate, two-way exchange of data, defined by low latency and interactivity. It powers calls, gaming, and collaboration. Next: WebRTC.