Every Major Streaming Term, Defined

Picture Quality Terms

Streaming menus and device spec sheets are dense with picture-quality acronyms. Understanding what each one actually controls helps you make sense of your settings and know whether your hardware can take advantage of what a service is offering.

Resolution describes how many pixels make up an image. 1080p (Full HD) has 1,920 × 1,080 pixels. 4K (Ultra HD) quadruples that to roughly 3,840 × 2,160. The jump is most visible on screens 55 inches and larger, or when you sit closer to the display. 1080p remains perfectly sharp on smaller or more distant screens.

HDR is often more impactful than resolution alone. Where resolution adds detail, HDR expands the range of brightness and color—making sunlit highlights crisp and shadow areas readable at the same time. The two dominant HDR formats are HDR10, an open standard found on most modern TVs, and Dolby Vision, a proprietary format that applies dynamic metadata frame-by-frame for more precise calibration.

Frame rate (fps) controls how smooth motion looks. Films are typically mastered at 24 fps for a cinematic feel. Broadcast TV uses 30 fps. Live sports and some gaming content streams at 60 fps, which produces noticeably smoother motion. Some services let you adjust this in settings. For a deeper look at how resolution and frame rate appear on displays, see our display specifications guide.

Audio, Compression, and Copy Protection Terms

Audio formats, video codecs, and content-protection standards form the less visible layer of streaming—but they directly affect what you hear, how much bandwidth you use, and whether content plays at all.

Codecs compress video files so they can travel over the internet efficiently. H.264 is the oldest and most widely compatible. H.265 (HEVC) cuts file size roughly in half at equal quality, enabling 4K streaming at practical speeds. AV1, developed by the Alliance for Open Media, compresses even further and is increasingly used by major platforms for high-resolution content.

Dolby Atmos and DTS:X are object-based surround sound formats. Unlike traditional channel-based audio (5.1, 7.1), they define where individual sounds exist in three-dimensional space—including above the listener. Reproducing this effect requires a compatible receiver or soundbar; otherwise the audio plays as a standard downmix. The HDMI eARC connection on modern TVs is what allows lossless audio formats to pass from a TV to an external audio system without quality loss.

HDCP (High-bandwidth Digital Content Protection) is the handshake that happens invisibly every time you start a protected stream. If any device in the chain—TV, HDMI switch, receiver—runs an older HDCP version than the content requires, playback will fail. Most 4K content requires HDCP 2.2 or higher. If you encounter HDCP errors, troubleshooting streaming quality issues walks through common solutions.

For related wireless vocabulary that affects how all this content reaches your devices, the wireless terms glossary covers Wi-Fi 6, 5G, and Bluetooth in plain language. And if you're deciding which device to stream on, streaming device types explained provides a clear comparison of your options.