What is vector?
Vector is defined as the use of points, lines, curves and shapes based on mathematical expressions. Because vector-based images are made up of lines rather than a specific number of dots, they can be scaled to a larger size without losing any image quality.
Raster is defined as a file that is resolution dependent. This means it cannot be scaled to any size without losing image quality. Raster graphics typically include photographs and photo-realistic images.
See an example of vector vs. raster images for 1 Color Imprint below