Other Uses
The individual cells of a grid system can also be useful as units of aggregation, for example as a precursor to data analysis, presentation, mapping, etc. For some applications (e.g., statistical analysis), equal-area cells may be preferred, although for others this may not be a prime consideration.
In computer science, one often needs to find out all cells a ray is passing through in a grid (for raytracing or collision detection) and that is called Grid Traversal.
Read more about this topic: Grid (spatial Index)