A DSL modem is a device that connects your home network to the internet using a Digital Subscriber Line (DSL) connection. It converts digital data from your computer into a format that can be transmitted over telephone lines, allowing for high-speed internet access without interrupting phone service. Typically, a DSL modem connects to a router, enabling multiple devices to access the internet simultaneously. It is commonly used in residential and small business settings, providing a reliable and cost-effective way to stay connected online.