What does the term "resolution" refer to in digital images?

The term "resolution" in digital images refers to the amount of detail an image holds. This is primarily determined by the number of pixels that make up the image; a higher resolution means more pixels and consequently more detail. For example, an image with a resolution of 1920 x 1080 pixels will display more intricate details compared to an image with a resolution of 800 x 600 pixels. This detail is crucial in graphic design as it affects the quality and clarity of images, particularly when printed or displayed on high-definition screens.

The other options, while related to image quality and characteristics, do not accurately define resolution. Processing speed relates to how quickly an image can be rendered or manipulated, color depth refers to the number of bits used to represent the color of each pixel, and aspect ratio describes the proportional relationship between an image's width and height. None of these aspects directly describe the detail contained in an image, which is why they do not align with the definition of resolution.