A router is a device that connects different networks and directs data traffic between them. It helps your devices, like computers and smartphones, communicate with each other and access the internet. By using a router, you can share a single internet connection among multiple devices in your home or office. Routers can be wired or wireless. A wireless router allows devices to connect without cables, making it convenient for mobile devices. Many routers also come with built-in security features to protect your network from unauthorized access, ensuring that your data remains safe while you browse the web.