Vector graphics are not pixels. They’re path instructions given to a digital device like a computer about the shape of an object.
Each path has a start and an end point, and groups of paths can create a somewhat complex object.
Because vector graphics are groups of paths, objects created with vector graphics can be enlarged to any size without loss of visual clarity. Vectors are resolution independent until the vector-created object is output. Because of this property people naturally believe turning a pixel-based image into vector information would allow the image to be enlarged to any size.
While vectors are good for mathematical shaping they’re not well suited for visual output in most instances. Scanners and cameras capture pixels – not vectors – for this reason.