Raster images are composed of pixels and have a defined proportion determined by their resolution.
This means if they were created at a certain size, that size cannot be stretched or altered without compromising quality or becoming distorted. You should always save raster files at the size they are intended for use to maintain their resolution integrity.
Standard raster files are JPEG, PNG, and GIF.
Vector images are composed of proportional formulas rather than having a defined proportion or a set number of pixels.
This makes vector files very “flexible,” it is helpful to know if you need to create a graphic that requires any resizing — like a logo used on a business card or even as a bus wrap!
Common vector files are EPS, AI, and PDF.