You should code the <dt> and <dd> element inside the <dl> tag.
<dt> specifies the short term of the name of the item while <dd> specifies the data description. It describes the <dt> element.
Syntax: <dl>….</dl>
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 Organization</dd></dl>