The technology essential for streaming high-definition videos typically includes robust codecs, adaptive bitrate streaming, and a solid content delivery network (CDN). Codecs compress and decompress video files, allowing for efficient data transmission without sacrificing quality. Adaptive bitrate streaming adjusts the video quality in real-time based on the viewer's internet connection, ensuring a smooth viewing experience regardless of fluctuations in bandwidth. CDNs distribute video content across multiple servers to reduce latency and buffering issues. Together, these technologies enable seamless high-definition video experiences on various devices and networks.