What is a vector logo

A vector logo is what the designer originally sends to you (Most likely in pdf). You can check if it is a vector by zooming in, a vector logo will never be pixelated.

.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.

.pdf: The Portable Document Format is built for the exchange of documents across platforms.

.svg: The Scalable Vector Graphics format is based in XML. It's useful for the web.