Vector files are handy when you need high-quality graphics that can easily resize to different scales. Since they're created using mathematical formulas, vector files won't become fuzzy or distorted — no matter how large or small you make them. Digital illustrations and company logos frequently take this form if the graphic needs to be sized up or down for a variety of promotional materials. From bite-sized business cards to T-shirts and posters, a logo saved in vector format won't lose its resolution.