The original iPod (mp3 mp4 player) introduced on 23 October 2001 marked the first iPod generation, and the latest iPod introduced on 12 October 2005 marked the fifth iPod generation, which was subsequently revised with a revision iPod model on September 2006, often referred to as generation 5.5. Note that the generations are referred with reference to the model name and not with reference to the date of release.
For a better understanding about iPod generations, check the following:
On October 23, 2001, the first generation of iPod was released. The model name was iPod and had the storage capacity of 5 to 10 gb. It used FireWire connection...
