Vector images are described by lines, shapes, and other graphic image components stored in a format that incorporates geometric formulas for rendering the image elements.
When I had read this kind of definition, I was not able to digest what exactly it is?
But becomes very clear when we see example images. As of now I don't have images but would try to define in simple manner.
RASTER IMAGE: At 100% raster version of the image looks almost the same as the vector version. Notice that as soon as the raster version is scaled, the pixels on the edge begin to show and the edges no longer look smooth.
Check out http://en.wikipedia.org/wiki/Raster_graphics to know more about Raster Graphics
VECTOR IMAGE: The vector image is created by defining points and curves. (This vector image was created using Adobe Illustrator.) When vector graphics are scaled, the edges remain crisp and sharp no matter the size.
To know more about Vertor Images Check out : http://en.wikipedia.org/wiki/Vector_graphics
I am sure you will be able to identify the type of image I have used above :)
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