Raster images consist entirely of pixels (or small squares).
When they are scaled up or scaled down, their quality is diminished.
Certain photo editing software can enhance the images to ensure the quality remains high enough
They are small dots that are laid out in a grid to form an image.
Displays that are used for computer monitors, mobile phones, and other devices, are divided into grids that display very small dots called pixels.
When you zoom in on the image, you will see its small squares (pixels).