A single router often leaves dead spots in larger or awkward homes. Mesh Wi-Fi uses several units placed around the house that work together as one network, handing devices smoothly between them so coverage stays strong as people move from room to room.
The benefit is reliable wireless everywhere without manually switching networks, which matters as homes fill with connected devices. Mesh systems cost more than one router and the units need sensible placement to work well, but for homes that struggled with a single device they have become the straightforward way to banish dead spots.