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WiFi is the nickname for Wireless Fidelity - high speed internet and network connection without the use of wires, cables and other stuff you can trip over.
The term wi-fi is not a technical term . It is expanded as as wireless fidelity , just like we use the term hi-fi to denote the high fidelity music systems . actually wi-fi is a certification process for wireless inter-operability conducted by a consortium named wi-fi alliance for your 802.11 compatible devices . It means not all your 802.11 wirless equipment are wi-fi certified and hence can not be officially called a wi-fi device .