Queues are everywhere. When you delete a photo on your iPhone, it goes to the Bin and will be deleted from there after 30 days. That is a queue. Without it you will not be able to recover a picture removed by mistake.
from My Pocket http://www.phpclasses.org/blog/post/332-How-to-Use-Queue-To-Speedup-PHP-Processing-Tasks-Part-1-Queueing-Slow-Tasks.html
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