Apple never made a product called iTouch. You’re thinking of a product called “iPod Touch”. It was the touchscreen version of the iPod (without the iconic clickwheel). The first one was essentially a slimmer iPhone 3G without a cellular modem.

I worked in an electronics repair store just after they came out. We replaced hundreds of broken screens on them. The sheer number of people who called them “iTouch” was surprising, considering Apple never called it that.