Vector graphics (sometimes called vector shapes or vector objects) are made up of lines and curves defined by mathematical objects called vectors, which describe an image according to its geometric characteristics. You can freely move, modify or scale vector graphics without losing detail or clarity, because they are resolution-independent—they maintain crisp edges when resized, saved in a PDF file, or imported into a vector-based graphics application. As a result, vector graphics are the best choice for artwork, such as logos, that will be used at various sizes and in various output media. Adobe Illustrator is a vector editing program.