Raster vs. vector, color depth, and compression — how images are captured, stored, and displayed.
Stores each individual pixel's color value. Highly detailed — ideal for photographs — but enlarging causes pixelation and file size grows with resolution.
Stores mathematical descriptions of shapes — points, curves, fills. Infinitely scalable with no quality loss. Ideal for logos, icons, and typography.
Computer monitors use an RGB display — each pixel is a set of three tiny lights (red, green, blue). By varying the brightness of each, any visible color can be produced.