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technology/internet/QUIC.md

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+---
+obj: concept
+wiki: https://wikipedia.org/wiki/QUIC
+rfc: https://datatracker.ietf.org/doc/html/rfc9000
+website: https://quicwg.org
+---
+
+# QUIC
+QUIC is a transport layer protocol developed by Google to improve the performance of web applications by reducing latency. It operates over the User Datagram Protocol ([UDP](UDP.md)) and is designed to provide a more efficient alternative to the traditional Transmission Control Protocol ([TCP](TCP.md)).
+
+## Key Features
+### 1. **Multiplexing:**
+- QUIC supports multiplexing multiple streams of data within a single connection. This enables parallel processing of data, reducing latency and improving overall performance.
+### 2. **Low Latency:**
+- QUIC is designed to minimize connection establishment and data transfer latency. It achieves this by combining the initial connection handshake with the first data transfer.
+### 3. **Adaptive Congestion Control:**
+- QUIC includes built-in congestion control mechanisms that adapt to network conditions, optimizing data transfer rates while avoiding congestion.
+### 4. **Connection Migration:**
+- QUIC allows for seamless connection migration between different network interfaces, such as switching between Wi-Fi and cellular data, without disrupting the user experience.
+### 5. **Forward Error Correction:**
+- QUIC incorporates forward error correction (FEC) to recover lost or corrupted packets without the need for retransmission. This enhances reliability in unreliable network conditions.
+
+## QUIC Components
+### 1. **QUIC Transport:**
+- Handles connection establishment, multiplexing, and reliable, in-order delivery of data.
+### 2. **QUIC Crypto:**
+- Responsible for securing the QUIC connection using encryption and authentication. It is based on TLS (Transport Layer Security).
+### 3. **QUIC Loss Detection and Congestion Control:**
+- Manages congestion control and packet loss recovery to ensure optimal data transfer rates.