.ai: Short for Adobe Illustrator, this file is commonly used in print media and digital graphics, such as logos.
.eps: Encapsulated PostScript is an older type of vector graphics file. .eps files don’t support transparency in the way more modern file formats like .ai do.
.pdf: The Portable Document Format is built for the exchange of documents across platforms and is editable in Adobe Acrobat.
.svg: The Scalable Vector Graphics format is based in XML (a markup language used widely across the Internet that's readable by both machines and humans). It’s useful for the web, where it can be indexed, searched, and scripted.