High Dynamic Range (HDR) refers to techniques in digital imaging that capture and display a greater range of tonal detail than standard images. In Photoshop, HDR allows working with images that have 16 bits or more per colour channel, using floating-point numbers up to 32 bits to represent a wider spectrum of light and shadow.
HDR also enables photographers to merge multiple exposures of the same scene, combining the brightest and darkest areas into a single image. This process preserves detail across highlights and shadows, creating visually striking photographs with enhanced depth and realism.