The principal feature of the iPod is that it can play media files, as it descriptions as a PMP says. The most use of an iPod is for music listening, Apple developing an entire accessory line and programs to help users at this chapter.

The accessory line starts with the white ear buds shipped specially for any portable media player designed and commercialized by Apple Inc. These ear phones are fabricated by Fostex, a big profile corporation from Japan. This earbuds become, in time, a symbol of the iPod brand even if the doctors said that they are very bad for our ears or the fashion designers told that, because of their color they contrast with the dark outlines of our clothes. Since the first generation of iPods, they were revised and upgraded, year after year, until they become smaller and more aerodynamic. The 4th generation of iPod Nano introduced also, as a special feature, the ear phones made from a material more different, that makes them more individual, but they let them to have a tendency to damage.

Starting with the 3rd generation of iPod Shuffle, Apple introduced a remote control located on the right earphone, and later, on the 3rd generation of iPod Touch, also with a microphone incorporated.

There are presently five forms of iPod ear phones. The first Apple earphones, without controls, ships on every iPod model, excepting the ones from 3rd generation. The Shuffle Headphones with a remote, ships only with the third generation iPods. The earphones that include the remote and the microphone are sold apart from others. This model was introduced in 2008 at the start of September.

The remote models have commodious buttons that will let the user to adjust the volume, to forward or backward the music, and control video playing. The control container which is located on the right earpiece’s cable include 3 buttons, and a small microphone for the late 2 models. The first button helps the user to adjust volume by pressing the “+” and “-” controls. The second will play or pause the videos or the music tracks. The last one will record sounds and voice memos on the sustained models.

iTunes is a protected trademark application of Apple, utilized for replaying and organize of digital files like music or videos, and it was special designed for iPods and iPhones. It also include a store that can be accessed via internet, and let the users to buy and transfer to their devices music videos, music, radios, TV shows, games for iPods, applications, pod casts, ring tones and movie renting.

This feature was released on January 9, 2001, by Apple Inc., at the MacWorld Expo, a conference that it is dedicated to Apple Macintosh platform and which is held annually in San Francisco. In 2009, in a Stevenote, Apple announced the release of the 9th version of iTunes.

This application is available for free download for some operating systems as Windows Vista and XP, Mac OS X version 10.4+ and Windows 7 and can be accessed from Apple’s site. Also it is bundled up with all Mac products and some Dell and Hp computers. There are also and some elder versions that can be downloaded for MAC OS 9 and Mac OS X version 10.0-3 and for Windows 2000.

This application let users to manage videos and music on their personal iPods, using as media player Quick Time, a multimedia framework free of charge which it is capable to handle several formats of video, audio, text, sound and animations. Also, there are some alternatives at this software like XPlay or Winamp for iPods. Someone who will use this feature can devise their music files into play lists and libraries, edit the file’s information, record some CDs, copy existing files to another digital audio player, purchase media files from its built in store, download pod casts, back up their files to digital supports like CDs or DVDs, run graphical effects into a visualizer, encode their music in some distinctly formats. Also, as a cool feature it is the availability of a huge collection of free internet radio broadcast stations prepared to be listened.

By creating a virtual library, in a specific data base, users can access and edit music attributes, known also as metadata, which are stored in 2 different library files. The first one, named iTunes Library, it is a binary file and uses the ITL file format. Using the ID3 tag, it stashes information like genre of the music and the artists that sings.

The iTunes Music Library it have the ability to refresh itself every time when the information is changed in iTunes. This library uses an .xml format letting the users to write easily some applications to access the information.