Vector graphics are stored as a list of attributes.
Rather than storing the data for each pixel of an image, the computer will generate an object by looking at its attributes.
The attributes are shown in bold, their values come immediately after the = sign.
It is easy to scale vector graphics without having to worry about the resolution. To alter the size of the rectangle a designer would just need to change the values for height and width.
This would often happen by simply increasing the size of the image by using the pointer within a graphics package. It is also possible to layer objects on top of one another without losing the data that is underneath (as would be the case in bit-mapped graphics).
Bitmap packages use several bitmaps to allow the user to create separate layers as part of an image, however these will always be combined into a single bitmap when the file is saved.
Changing the complexity of a vector graphic image will change its file size because of the additional information which needs to be stored.