by 
Anonymous
ANSWERS: 3
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"A bitmap [raster] image uses a grid of individual pixels where each pixel can be a different color or shade. Bitmaps are composed of pixels. Vector graphics use mathematical relationships between points and the paths connecting them to describe an image. Vector graphics are composed of paths." Taken from: http://www.ou.edu/class/digitalmedia/articles/Vector_vs_raster_more.htm
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"Raster" or "bitmap" images use small squares of color called pixels to create the illusion of an image, similar to a mosaic. Vector images do not use pixels, rather they use points and mathematically-defined curves to create shapes. The significant difference is that in a raster image, each pixel is a finite piece of information. The larger the image, the more pixels, hence the more information in the image. Pixel images can also lose a significant amount of image quality when they are enlarged, due to inaccurate resampling. Vector images, since they are only plotting points, lines, and curves, can be resized to any dimension without losing any image quality whatsoever.
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The two ahead of me answered your basic question, but there is another point that I can think of that matters and that is FILE SIZE. bitmaps or raster images are resolution dependent. This means that the higher the concentration of dots per inch the larger the file size. For example, a graphic that will be seen on the internet is required to be only 72 pixels (or dots) per inch and has a much smaller file size than one that is intended for print where the requirements are 300 dots per inch. Dimensions of the graphic also play a large role in file size here. Vector images, generally produce much smaler file sizes than bitmaps because they are not resolution dependent. The file produced is the same size regardless of the dimensions of the image, be it icon size or billboard size. There are a lot more software useability differences between the two types also.
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