Modular design, or "modularity in design", is purposely designing a particular process that can be broken down into smaller parts or sections and can be integrated into different systems or can be created individually.
A modular design creates a reduction in cost and allows you to be more flexible in design. Having modular design benefits you by lowering your costs because of minimal customization and shorter time needed to become familiar with the products. Modularity offers other benefits such as augmentation (adding new solution by merely plugging in a new module), and exclusion. One useful application of modular design is with modular LED lighting.