Raster and Vector are two types of formatting application of any image. Raster images are usually developed by pixel integration and lower resolution. Whenever, you zoom the image will break the pixels and you can’t possibly understand the objects of the image. This type of images are significantly meaningless photo for anyone if they want to use it to display.
On the other hand, vector images are developed by shape regeneration, every objects of an image developed into a single shape by which you can use the shape however you want. You can easily convert vector image to any other format which is the most promising feature of vector image. You will be able to change the size of the shape to any extent. You also be able to zoom the shape to any further.
Mostly we get quotation request for raster to vector image conversion. That means, regenerating the vector shapes from existing raster images. So that, they can use their favorite images in any way they want.