Start with the cause of the weak connection
Check whether the issue affects one room, one device or the whole home. A coverage gap differs from an internet service outage, router fault or congestion problem, and each needs a different fix.
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Guide
They can help when a usable router signal reaches a coverage gap. They are less useful when the source signal is already weak or the connection problem is not coverage.

Check whether the issue affects one room, one device or the whole home. A coverage gap differs from an internet service outage, router fault or congestion problem, and each needs a different fix.
A range extender relays a wireless network into a farther area. It needs a usable connection to the router, so location is central to whether the added coverage is useful.
If you can run Ethernet, a wired access point can put Wi-Fi nearer the problem area. Some extenders offer access point mode, but support varies by model.
Walls, floors and interference affect radio links. Try a location between the router and the room needing coverage, then check performance there before settling on a permanent position.
Check band support, Ethernet needs and the number of areas you want to cover. A single extender suits a focused gap better than a plan to provide consistent coverage across several floors.
Common questions
They can improve access in a dead zone when placed within reach of a reliable router signal. Results depend on home layout, interference and device placement.
It may be worthwhile for a specific weak-coverage area if repositioning the router does not solve it. Compare an extender with a wired access point or mesh system for your layout.
If the extender itself receives a poor signal, or the issue is a slow internet plan or router fault, repeating Wi-Fi may not fix the cause.
Place it between the router and the area with weak coverage, where it can still receive a useful signal. Avoid hiding it behind obstacles or placing it inside the dead zone.