Which statement best describes a raster image?

• A. It is composed of a grid of pixels.
• B. It is defined by mathematical curves.
• C. It is a vector graphic.
• D. It is primarily used for audio.

Answer: (A)

A raster image is defined by its grid of pixels, with each pixel carrying color information to build the overall picture. This structure means detail depends on resolution—the more pixels you have, the finer the detail, but enlarging a raster image can make it look blocky because you’re simply magnifying those individual pixels. This is why raster formats are great for complex photos with lots of color variation, like JPEG or PNG, but they don’t scale as cleanly as vector graphics, which use mathematical curves to describe shapes. It’s not about audio, since audio is a separate domain of sound data. So, describing a raster image as being composed of a grid of pixels is the best fit.