what is the use of COM in visual studio?

Question

Hi sir,
    Tell me the use of COM in visual studio. What is the use of clsid, in the below code. Kindly give me the solution for this problem.


<object id="mediaplayer" classid="clsid:22d6f312-b0f6-11d0-94ab-0080c74c7e95" codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#version=5,1,52,701" standby="loading microsoft windows media player components..." type="application/x-oleobject" width="320" height="310">
<param name="filename" value='<%=str %>'/>
<param name="animationatstart" value="true"/>
<param name="transparentatstart" value="true"/>
<param name="autostart" value="true"/>
<param name="showcontrols" value="true"/>
<param name="ShowStatusBar" value="true"/>
<param name="windowlessvideo" value="true"/>
<embed src='<%=str %>' autostart="true" showcontrols="true" showstatusbar="1" bgcolor="white" width="320" height="310"/>
</object>