'Wi Fi only' means you can only used where there is Wi Fi as opposed to using a cellular network such as 3G and 4G. A smart phone uses cellular and Wi Fi. So if you're out and about a lot away from coffee shops, pubs etc and want to use iPad then cellular is useful. I hope that helps.
I think they are meaning to advise that it works on wifi only with no option of 3G via a SIM card. Other models have that option and are more expensive
If you are out and about with your I pad, It means you can only use it in places they have WiFi like an internet cafe or Library , most homes now day's have WiFi, so as long as you have WiFi in the home you should be fine.
can you use your hotspot on your phone to the wifi on this ipad
answered on 16 Jan. 2015