Apple 's iPod is probably the best known MP3 player. The music player, which can play all sorts of audio file formats - MP3, Advanced Audio Coding( AAC), Waveform Audio File(WAV), Audio Interchange File Format( AIFF), and Apple Lossless - has since evolved into iPod video.
With storage capacities ranging from 30 GB to 160 GB, the 2.5- inch color display can play videos in Quarter VGA( QVGA). The TFT display has brilliant color fidelity and good brightness. Apple's iPod video supports Simple Profile of MPEG-4 and the Baseline Profile of H.264/ AVC. With H.264/AVC, the resolution is limited to 320 x 240 pixels, but this is perfectly sufficient for the small 2.5-inch color display. For larger screens, XivD and MPEG-4 can be used, allowing displays in higher resolutions.
Apple`s iPod is available in a wide variety of models, sizes and colors. The classic iPod has a mini hard disk with up to 160 GB, whereas the iPod- nano has a flash memory with 8 GB. Video playback time is about 6 hours for the largest memory version, and about 3.5 hours for the iPod-nano.
The iPod Touch is a portable media player( PMP), personaldigital assistant( PDA) and WiFi platform for WLANs. In addition to the functions familiar from the iPod, it has a multi-touch screen that forms the user interface. The iPod Touch is available with 8GB, 16GB and 32GB flash memory. It has the Safariweb browser and wireless access to iTunes and apps offered in the App Store. In a later version it was equipped with internal speaker and with Bluetooth.