Already in use on some Android smartphones like Samsung's Galaxy S21 Ultra, pixel binning merges data from multiple smaller pixels on the camera's image sensor into one "super-pixel" for improved low-light sensitivity.

Pixel binning is beneficial because simply increasing a smartphone camera's megapixels while maintaining the same camera sensor size results in smaller pixels, which generally capture less light, leading to lower-quality low-light photos. Pixel binning would allow iPhone 14 Pro models to shoot high-resolution 48-megapixel photos in bright conditions and 12-megapixel photos in low-light conditions that are still of high quality.

See https://www.macrumors.com/2021/12/14/iphone-14-pro-pixel-binning-rumor/

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