A wifi router is the same as a wireless router, it is an electronic device that can connect all compatible devices to internet service wirelessly.
A wireless router is connected directly to a modem by a cable. The signals received from the cable will be sent to other Wi-Fi-capable devices by it. Besides, it also functions as a wireless access point.
A wireless router is different from a modem.
A modem connects you to the Internet, but a router can not connect you to the Internet directly. It distributes the internet received from a modem to other connected devices.
Now a Wi-Fi 5 or Wi-Fi 6 router is doubtlessly the best Wi-Fi router for home use because it is easy to set up and has a good range for spreading fast internet out to your devices.