Audio is a sound within the acoustic range available to humans. Audio can be used through the web. This is because the audio can make the presentation alive. Besides, the audio also can improve the navigation system through voice over or background sound. In the world wide of web, there are two ways a user can access audio function in a web page. The first one is known as streaming and the next one is known as downloading.

Streaming means the users can access the audio files on the spot (in real time) without downloading the files. In addition, it utilises playback function for the users. This example can be found in webpages like http://www.litefm.com.my/

On the other hand, downloading enables the users to download the files so that they can transferred the files into any hard drive. This can be seen in webpages like www.anymusicdownloads.com

There are a few factors that effect the rate of transferring audio data such as:

1. The Internet speed

2. The file size and the quality of the audio

3. Compression technique that has been used

4. The technology of distributing the audio

There are a few formats of audio file. For example, mp3, real audio or MIDI.Mp3 has smaller size but retain the quality of the music while real audio has smaller size than mp3 but unfortunately decrease the quality of the music.Besides, MIDI file audio is only concern about the music itself rather than the singer like the instrumental music. So, the size is quite small and need less time to be downloaded.