DESIGN WITH GRIDS
A grid is an invisible structure used to guide the placement of elements on your page. Now days using a grid are one of those basic design principles.
Most news and editorial designers are working with grid systems someone else designed. No matter what you think about it, how you know about it, you need to understand how to use it.
The lines of the grid themselves are not necessarily visible (although in some designs they are) but they are used by the designer to create the proper width and height of elements to align the page. It is commonly seen in newspaper and magazine layout with columns of text and images. One grid, or a collection of grids, may be used across an entire project to achieve a consistent look and feel.