It's especially good for anyone who edits on the computer to know that a bitmap image is simply another term for a digital image. When I heard the word 'bitmap', I always imagined that it was juts another type of file. To put it simply, "while a .jpg file is always a Bitmap graphic, a Bitmap graphic is not always a .jpg file". (http://www.eastbywest.com/pub/vectorbitmap/).
A bitmap, or digital image is made up of a bunch of dots, or rather squares. Much like some pointalistic paintings that exist, only a computer has the squares lade out mathematically on a grid so that is may easily refer to them and make changes to them if a person desires to manipulate the image in a certain way.
The more pixels (squares that make up the image) in a digital bitmap file, the better the image looks. The image becomes distorted if when you try to make it bigger. If there is not enough information (that is square pixels) then the computer won't know what to do when you want the picture bigger, so it will make things up. And that's not nice.
A vector image is different than a bitmap image. Depending on what it is that you need to do, a vector image can be more convenient than a bitmap because it is much more simple. when you make a line with a vector tool, all the pixels of that line are black, or whatever color you want - and so all the pixels that are put together are one solid color. and that's nice.
however, there is only so much one can do whilst making an image with a vector tool. usually, a vector image should not be complex because it always ends up having the same undesireable (in my oppinion anyway) effects. Making a simple design with a vector image is often very convenient, because it can easilly be reshaped, resized or duplicated. and that's really nice.
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