bitmap: each individual pixel has a value. These pictures can get pretty big since you need to define each pixel
vector: picture is defined by lines, fills and other bits 'n pieces and the picture is rendered. this is what agi uses
the difference is like html and a screenshot of a webbrowser rendering html.
noptec vector takes a bitmap file (gif, jpeg. whatever) and tries to turn it into a vector format for you.
- Nick