Explain the difference between vector and raster graphics, and when you use each.
What the interviewer wants to hear
- Vector: shapes defined by maths, scale infinitely
- Raster: pixels, fixed resolution
- Vector for logos, icons, illustrations, type
- Raster for photos and complex textures
- Common formats and tools for each
Model answer
Vector graphics are made of paths defined mathematically, so they can scale to any size without losing quality, and files stay small for simple artwork. I use vectors for logos, icons, line illustrations and type, usually in Illustrator, and save them as AI, EPS, PDF or SVG. Raster graphics are grids of pixels, so their quality depends on resolution: enlarge them too much and they become blurry or pixelated. Raster is right for photos and rich textures, edited in Photoshop and saved as PSD, TIFF, JPEG, PNG or WebP depending on use. In practice most projects combine both: a vector logo and type placed over raster photography in an InDesign or Figma layout. The key is to keep master files in the right format and export suitable versions for each output.
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Take a timed easy round and get scored on every answer.
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