Vectors are digital images made up of points and paths. Unlike other image formats that are made up of pixels, vectors can be heavily edited and resized to your fit needs without losing image quality.
There are many design programs that are capable of editing vector files. Adobe Illustrator is the industry standard, but you can also use software like Adobe Photoshop, CorelDRAW, and Inkscape.
Vectors come in many file formats like .AI, .EPS, .SVG, & .PDF. When you purchase vector files from grapholia, you can get all these formats with each vector.