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vector is a mathematic representation of some geometric form. Vector files are scalable, which means that they will maintain quality no matter the size, which is why they are recommended for large-format printing. Programs such as Adobe Illustrator, InDesign, and Corel Draw are all natively vector-based applications that allow designers to create artwork where the resulting file is a collection of vectors. Some examples of vector-based file extensions are .AI, .CDR, .EPS, .PDF, etc. Please note that .CDR files must be saved as a .PDF before uploading.