WiFi is the primary wireless method by which tablets communicate and connect to the internet. Bluetooth is a different wireless communication method, but WiFi is essential for internet usage, watching streaming content and video chatting. Naturally, the LeapPad Ultimate does come with WiFi, using 802.11 b/g/n.
WiFi is essential for internet access but the LeapPad Ultimate does have features that can be used offline as well. The tablet has a cartridge slot with a library of educational games and material that can be used on the tablet without internet access. Content stored directly on the tablet will typically not require internet access either.