Vector files are mathematically defined images, that are made up of points. Unlike pixel graphics or raster files, vector graphics can be infinitely scaled without affecting the resolution. Vector files are especially important for realising large print products.
You can recognize vector files by their file type. The most common vector file types are:

• AI = short for Adobe Illustrator Example file type: Logo_weiß.ai
• EPS = Encapsulated PostScript is an older vector graphic format. Example file type: Logo_weiß.eps
• PDF = Portable Document Format is a vector format used for exchanging documents. Example file type: Logo_weiß.pdf
• SVG = Scalable Vector Graphics-Format is based on XML and especially suited for web applications. Example file type: Logo_weiß.svg

Attention! Vector files can contain placed pixel files, which means that they don’t contain 100% vectors only.
It is best if you send us all your vector files, so that we can check them.