What is the technical architecture of zoom?

Zoom's technical architecture is meticulously designed to deliver high-quality, reliable video conferencing services at scale. The key components of this architecture include:

1. Distributed Architecture: Zoom employs a distributed system of data centers interconnected through private links. This setup ensures global connectivity, allowing users worldwide to join meetings via the nearest data center, thereby reducing latency and enhancing performance.

2. Multimedia Routing: Unlike traditional Multipoint Control Unit (MCU) systems that process and distribute a single video stream, Zoom utilizes multimedia routing. This approach sends multiple video streams directly to clients, reducing the computational load on servers and enabling support for a larger number of participants in a meeting.

3. Multi-Bitrate Encoding: Zoom's multi-bitrate encoding allows a single video stream to adapt to various resolutions based on the client's network conditions and device capabilities. This dynamic adjustment ensures optimal video quality across diverse environments.

4. Application-Layer Quality of Service (QoS): Zoom implements QoS at the application layer, optimizing audio, video, and screen-sharing experiences tailored to each device and network scenario. This strategy enhances reliability and user satisfaction.

5. Protocol Flexibility: Zoom supports multiple network protocols, including UDP, TCP, and SSL. The client attempts to connect via UDP first for its low latency; if unsuccessful, it falls back to TCP, and then to SSL as a last resort. This flexibility ensures robust connectivity across various network configurations.

6. Meeting Zones and Multimedia Routers (MMRs): Zoom's infrastructure includes Meeting Zones, each comprising a Zone Controller and Multimedia Routers. The Zone Controller manages activities within the zone, while MMRs handle the distribution of audio and video streams among participants.

This comprehensive architecture enables Zoom to provide scalable, high-quality video conferencing services, accommodating a vast number of users and diverse network conditions.