The <dd> tag describes about the short term(i.e. <dt> element) in the description list.
You must –
Code the <dd> and <dt> element inside the <dl> tag
Code the <dt> element before the <dd> tag
Syntax: <dd>text…</dd>
Example
<dl><dt><b>AIR</b></dt><dd>All India Radio (Broadcasting)</dd><dt><b>CDMA</b></dt><dd>Code Division Multiple Access</dd><dt><b>DVD</b></dt><dd>Digital Versatile Disk</dd><dt><b>FAO</b></dt><dd>Food and Agriculture Organisation</dd></dl>