Does what it says – show your tag cloud.

 
<?php wp_tag_cloud(array( 
'smallest' => 10,      // size of least used tag 
'largest' => 18,       // size of most used tag 
'unit' => 'px',        // unit for sizing 
'orderby' => 'name',   // alphabetical
 
'order' => 'ASC',      // starting at A 
'exclude' => 6         // ID of tag to exclude from list 
)); ?>