Though there are many image file formats and file extensions, they all fall into one of two categories: rasters and vectors.
Raster images are the more common of the two image types. They’re high-quality, complex files created using millions of minuscule pixels. Because of this, they cannot be drastically resized without appearing grainy and low-quality. Here is an example of what happens when you resize a raster without any other changes.
Vector images are created using polygons rather than pixels. Unlike raster images, vector images retain quality when resized. One drawback of large vector images is that they require more polygons to retain quality, which can create incredibly large files.
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