Example, if I download updates for Ubuntu, or I download some torrent file, or something, then I don't want my important stuff such as SSH, IRC, IM, VoIP to get lagged.
So you have the important traffic prioritized, and have non-important traffic like apt-get and torrents de-prioritized.
This way I can do stuff like listen to online radio without skips, or play an online game without lag, or administer a server remotely with SSH without type-lag, have a VoIP conversation without skips, or chat on IRC or Pidgin without delays, all the same time while I am fetching updates, and downloading movies on BitTorerent.
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