The style of the grid refers to the aesthetics of the design and how it divides the glass pane. Window grids have no functional purpose, nor do they add structural integrity to your windows. The purpose of window grids is to add curb appeal and design elements to your home. In this post, we’ll discuss everything you need to know about window grids so you can decide if they make sense for your new windows. There are a variety of styles and types of grids. Window grids, also known as window grills or muntins, are partitions used to visually divide a window into smaller sections for aesthetic reasons.