The iPod is a line of portable media players and multi-purpose pocket computers designed and marketed by Apple Inc. The first line was released on October 23, 2001, about 8½ months after iTunes (Macintosh version) was released. The most recent iPod redesigns were announced on July 15, 2015. There are three current versions of the iPod: the ultra-compact iPod Shuffle, the compact iPod Nano and the touchscreen iPod Touch. 

Like other digital music players, iPods can serve as external data storage devices. Storage capacity varies by model, ranging from 2 GB for the iPod Shuffle to 128 GB for the iPod Touch (previously 160 GB for the iPod Classic, which is now discontinued). 

Apple's iTunes software (and other alternative software) can be used to transfer music, photos, videos, games, contact information, e-mail settings, Web bookmarks, and calendars, to the devices supporting these features from computers using certain versions of Apple Macintosh and Microsoft Windows operating systems.
Is the iPod a phone?
Is it a portable device?
What is it exactly?
How many kinds are there currently?
Is the iPod Classic one of them?
Who makes the iPod?
When was it first put out?
Was that before iTunes?
What happened on July 15, 2015?
Which did these include?
Which is the smallest?
How did the iPod Touch get its name?
Can iPods store files?
Which current type can hold the most?
How large is that one?
Is that the biggest they've ever made?
Which one was?
How many gigs was that one?
How does one transfer music on an iPod?
Does it work with Windows?
No
The iPod is a line of portable media players and multi-purpose pocket computers
Yes
The iPod is a line of portable media players 
a line of portable media players and multi-purpose pocket computers
The iPod is a line of portable media players and multi-purpose pocket computers
three
There are three current versions of the iPod
No
the iPod Classic, which is now discontinued
Apple Inc.
designed and marketed by Apple Inc.
October 23, 2001
The first line was released on October 23, 2001
No
about 8½ months after iTunes (Macintosh version) was released.
The most recent iPod redesigns were announced
The most recent iPod redesigns were announced on July 15, 2015.
the iPod Shuffle, the iPod Nano and the  iPod Touch.
There are three current versions of the iPod: the ultra-compact iPod Shuffle, the compact iPod Nano and the touchscreen iPod Touch. 
iPod Shuffle
 the ultra-compact iPod Shuffle
the touchscreen
the touchscreen iPod Touch
Yes
iPods can serve as external data storage devices
iPod Touch
128 GB for the iPod Touch
128 GB
128 GB for the iPod Touch
No
previously 160 GB for the iPod Classic, which is now discontinued
the iPod Classic
previously 160 GB for the iPod Classic, which is now discontinued
160 GB
160 GB for the iPod Classic, which is now discontinued
Apple's iTunes software (and other alternative software)
Apple's iTunes software (and other alternative software) can be used to transfer music
Yes
devices supporting these features from computers using certain versions of Apple Macintosh and Microsoft Windows operating systems.