What is the difference between iTouch and iPod Touch?

There was a time when the iTouch and the iPod were very popular. The iPod made it possible for people to listen to various songs easily. They would download the songs and just listen to the songs whenever they can. The iTouch is a bit different because you can control the songs that you will listen to simply by touching the screen, whereas, on the iPod, you need to use buttons.
The screen of the iPod Touch is also bigger as compared to the iPod video. There are different variations of the iTouch, and the iPod that was released in the past, and people were so excited to get them simply because they were made by Apple.