WiFi boosters, repeaters, and extenders are mostly the same thing – devices to improve WiFi coverage.

WiFi repeaters work by receiving wireless signal and rebroadcasting it, but single band repeaters have to receive, then retransmit each packet of data using the same radio on the same channel. This can cost single band repeaters 50% of their bandwidth. Dual band repeaters get around this by connecting to the router on one band and outputting a WiFi signal on the other     WiFi repeater is used wirelessly

Extender  Wi-Fi extenders connect to your network through either an Ethernet cable. Wi-Fi extenders provide a more stable connection

Use  an extender if there are obstructions like walls of furniture in between.