Thanks @jbv, super helpful and informative to define the difference between Rasters and Vectors.
Raster are made of pixels and are not good candidates for Resizing, but are typically better for blending of colors or shades.
Vectors are made of mathematical equations and will not lose any resolution at any size, but are better for high contract applications like logos.
Since Vectors define the outer edge of the design element, the laser-head movement would be a continuous line around that particular element. Since Rasters excel at blending colors and shades, the laser-head movement accommodates for this by moving left-to-right and combines many lines (lpi - lines per inch) to create the same effect.