All custom print orders need to be submitted with vectored artwork. Vectored graphics allow us to easily scale your artwork to the size it needs to be without experiencing any loss of quality in the image.
Vectored formats will come in either .ai or .EPS files. Generally artwork is vectored if you are able to resize your image without it becoming jagged or distorted no matter how big you make it.
All fonts need to be converted to outlines. "Converting font to outlines" means that you will have to change the font in your file from text to an object in order to maintain that font when it's printed.
If a particular font is not installed on a computer trying to open your file, then the computer will substitute a generic font for the original. This completely changes the way the font will appear and print. However, if your font is converted to outlines, then it allows the computer to read it as an image object rather than as just text.
In Adobe Illustrator this may be achieved by right clicking on the text you wish to convert and then right clicking it and pressing "Create Outlines".