The Difference Between Adobe Photoshop and Adobe Illustrator. … Photoshop is based on pixels while Illustrator works using vectors. Photoshop is raster-based and uses pixels to create images and is designed for editing and creating photos or raster-based art.
In simple terms, you can design graphics in both, however, because illustrator works in pixels, this means you can scale up a piece of artwork to a much greater size. Doing the same in PhotoShop will make the image look poor.