A single, standalone router is generally adequate for smaller offices, or single-story homes with one or two bedrooms. But if you have rooms on other floors, or thick walls that can block your Wi-Fi signal, then you may experience "dead zones" that have weak Wi-Fi. A mesh system uses several devices -- usually a main router and one or more satellite nodes -- in different locations to extend the Wi-Fi signal beyond the range of a single router.Most mesh systems are aimed at home users and marketed as easily-configured solutions for "whole-home Wi-Fi," but some are particularly suitable for business users. These systems may include features such as multiple Ethernet ports or the ability to create several networks with different passwords.