Scalable Vector Graphics (SVG) is an open file format for vector graphics based on XML. Thanks to the work of a research group created in 1998 by the W3_Consortium: the Scalable Vector Graphics (SVG). SVG enables Web developers and designers to create dynamically generated, high-quality graphics from real-time data with precise structural and visual control.
This format based on other public standards (XML, CSS, HTML) which allows for the creation of vectorial images which are re-scaleable, perfect to save bandwidth, to optimise layout and to allow zooming without losing the quality of the image. Graphics created in SVG can be dynamic or interactive, can group, transform, create graphic objects within other objects and be given style attributes.
With this powerful new technology, SVG developers can create a new generation of Web applications based on data-driven, interactive, and personalized graphics.
The good things about using this open format is you can easily transfer and edit them in any platform. I think, most vector designing softwares nowadays like Adobe Illustrator, Xara Extreme and Corel Draw support this format. So, you don't have to worry about some proprietary file format like .ai or .cdr where you can't open them on other software when you transfer the file to another computer that don't have the proprietary software to open it.