What mean by grayscale value?

Grayscale value refers to the intensity of light in a pixel within a grayscale image, where each pixel represents a shade of gray. This value typically ranges from 0 to 255 in an 8-bit image, with 0 representing black, 255 representing white, and values in between indicating varying shades of gray. Grayscale images contain no color information, relying solely on these intensity values to convey visual information.