Differences Between The Html Tags Of Embed, Object, And Video?

What are the technical differences between those three tags and why would someone use one over the other? In HTML 4 why did embed fall out of favor and have object replace it, only

Solution 1:

This might help: http://www.stoimen.com/blog/2009/02/22/html-object-and-embed-tags/

As for the video tag, WMVs wont always work because if you're on a Mac you would have to install a plugin