Big houses and large office often have weak WiFi signals and dead zones where the signals from the router can’t reach. A WiFi range extender comes handy in such situations. They help by boosting the WiFi range.
WiFi range extenders or WiFi repeaters or WiFi signal boosters are a type of wireless repeater that is used to expand the reach of a wireless LAN. The range extender connects wirelessly to the router, picks up the signal and retransmits it.
All too often, the routers supplied by broadband companies aren't quite up to the job. And if they are, the issue instead is that it has to be located right in the corner of the house – bad news for anyone whose bedroom is in the opposite corner.