Photoshop Tutorials : Vector Vs Raster Image
Rasters and vectors defined
A raster image is made of up pixels, each a different color, arranged to display an image.
A vector image is made up of paths, each with a mathematical formula (vector) that tells the path how it is shaped and what color it is bordered with or filled by.
The major difference is that raster image pixels do not retain their appearance as size increases - when you blow a photograph up, it becomes blurry for this reason. Vector images do retain appearance regardless of size, since the mathematical formulas dictate how the image is rendered.
Pros and cons of rasters and vectors
Raster images are capable of displaying a myriad of colors in a single image and allow for color editing beyond that of a vector image. They can display finer nuances in light and shading at the right resolution. Vector images are scalable, so that the same image can be designed once and resized infinitely for any size application - from business card to billboard.
Raster images cannot be made larger without sacrificing quality. Vector images cannot display the natural qualities of photographs. Raster images are often large files, while vector images are relatively lightweight. Raster images are used in web and print, vector images cannot as of this writing be used in electronic format - they must be converted to a raster first. Vectors display at the highest resolution allowed by the output device, while rasters blur when blown up.
Links that might help:
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