What is a 64gb iPod touch and what features does it have?

64gb refers to the amount of things that can be stored on the iPod. For example a 4gb maybe able to hold 500 to 1000 songs, videos, pictures etc. While a 64gb can hold much more. The 64gb is best for someone with a large amount of data that they wish to put on the iPod. The 64gb is generally more costly.