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Definition
Resolution describes the number of pixels in an image or video, typically expressed as width x height (e.g., 1920x1080). Common video resolutions include 720p (HD), 1080p (Full HD), 1440p (2K), and 2160p (4K). Higher resolution means more detail but larger files.
Resolution determines the level of detail in digital images and video. A 1920x1080 (1080p) image contains about 2.07 million pixels, while a 3840x2160 (4K) image contains 8.29 million pixels — four times the data. The "p" in 1080p stands for progressive scan (each frame is drawn completely), as opposed to "i" for interlaced.
Common resolution standards: 640x480 (SD), 1280x720 (720p/HD), 1920x1080 (1080p/Full HD), 2560x1440 (1440p/2K), 3840x2160 (2160p/4K), and 7680x4320 (8K). For web images, the target display resolution determines the optimal image size — serving a 4K image on a mobile screen wastes bandwidth.
When compressing or converting video, reducing resolution is one of the most effective ways to decrease file size. Dropping from 4K to 1080p reduces pixel count by 75%, proportionally reducing data requirements. Responsive image strategies serve different resolutions based on the user's screen size and connection speed, using srcset and sizes attributes in HTML.