Glossary

3GPP: The abbreviation for Third Generation Partnership, which was formalized in 1998. For more information, see also www.3gpp.org.
3GP File: A 3GP file is specified in the 3GPP standardisation and designed for utilisation in the mobile sector. It is essentially based on the MP4 file format.

AAC (Advanced Audio Codec): AAC is an audio codec and specified in the MPEG-4 standard. AAC is an optional audio codec in the 3GPP specification and the mandatory audio codec in MPEG-4. See also http://www.chiariglione.org/mpeg/faq/mp4-aud/mp4-aud.htm .
Add-on: An add-on is software for software. Effectively, it expands on the functionalities and capabilities of a piece of software.
AC-3: AC-3 is a audio codec developed by Dolby Laboratories and used in most cinemas and on DVDs. For further information, please visit www.dolby.com.
Active Streaming Format (ASF): ASF is a very versatile Windows Media file format, which can contain objects such as audio, video, HTML, ActiveX, etc. ASF as a format has been designed by Micro- soft specifically for streaming audio/video content. However, today, ASF is somewhat outdated and not fully supported any- more. The omnipresent Windows Media format is the legitimate successor for ASF. For more information on Windows Media, please visit www.microsoft.com.
ADSL (Asymmetric Digital Subscriber Line): ADSL is high- speed, always-on Internet connectivity provided through regular copper telephone lines. Most offers available are based on flat fee subscriptions. Asymmetric stands for the fact that ADSL supports different data rates for the upstream and downstream.

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Understanding MPEG-4