Raster engraving is the standard laser engraving process. This process uses a graphic built from pixels which is engraved line by line, point by point.
Vector engraving, on the other hand uses graphics consisting of curves and lines that are traced one after the other “vector by vector”. These are engraved at the same time. Another common name for vector engraving is “scoring”.
For larger-area applications such as filled letters, images, stamps or wood engraving, raster engraving is the method which should be used.
If you are only engraving thin lines then vector engraving is better suited and may also be faster.