Daily powers real-time audio and video capabilities for millions of people worldwide, primarily through its APIs and client SDKs used by developers to build audio and video features into applications and websites. The company's infrastructure is critical to delivering reliable video call experiences, especially in scenarios where participants have slow or unstable connections. Simulcast is a technique used to adapt to bandwidth and CPU constraints, allowing for better video quality during multi-participant calls. Daily has implemented simulcast support since 2017 and has devoted significant engineering hours to improving its implementation. The company aims to provide adaptable simulcast configurations that work well for various use cases, while also supporting custom configuration options for applications with specific needs. Daily's infrastructure is built on WebRTC, a standard that allows for flexible routing of video through media servers or peer-to-peer connections. The company has developed best practices for bandwidth management, CPU usage, and server-side simulcast implementation to ensure high-quality video experiences. Video codecs, such as VP8, H.264, and newer Scalable Video Codecs like SVC, play a crucial role in delivering high-quality video streams. Daily is continually working on improving its infrastructure and video codec support to provide the best possible experience for its customers.