Audio, video and images are combined in a portable media player. MP3 is the most common audio format used in them. Many of them might also support other audio formats as the Windows Media Audio, WAV and the Advanced Audio Coding (AAC). Usually LCD or the OLED screen is used to display images and video. The most common format used is the JPEG format although file formats as the TIFF, PNG and GIF formats might also be supported to view images. MPEG-4 video format is the most common format used in these players. They may also be able to use video formats such the AVI as well as the Windows Media Video (WMV) formats. USB cables are used to transfer audio as well as video files between the computer and the players or the portable digital assistants (PDAs).
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