Bitrate is how much data per second a video uses — measured in kilobits or megabits per second (kbps / Mbps). It's the single most important number for the cost and quality of any streaming product: every byte your CDN delivers, every minute of buffering a viewer suffers, every cent of bandwidth bill on your AWS account ultimately traces back to bitrate.
Concrete reference points for 2026 streaming. 1080p H.264 streaming sits around 4–8 Mbps. 4K HDR can be 15–25 Mbps in HEVC, or 10–18 Mbps in AV1. Live video calls (Zoom, Teams) typically use 1–3 Mbps. A 4G mobile connection comfortably delivers 5–10 Mbps in practice, home Wi-Fi often 50–500 Mbps. So a 4K stream that needs 20 Mbps is fine on home Wi-Fi, marginal on mobile, and a hard "no" on hotel networks.
The complication is that "more bitrate = better quality" is only roughly true. The real lever is the combination of bitrate plus codec efficiency. Switching from H.264 to AV1 lets you cut bitrate roughly in half at the same quality — which is exactly why services like YouTube and Netflix are migrating to AV1 in 2026: same quality to the viewer, dramatically smaller CDN bill. Modern smart encoding (crf, per-title encoding) goes further by varying bitrate scene by scene, spending more on hard content (action, snow, water) and less on easy content (talking heads, static graphics).
