From b2evolution manual

Display tags associated with item.

These tags can be edited using edit post form in 'Tags' field.

[edit] Example

<source lang="php"> $Item->tags( array(

'before' => '',

    'separator' => ', ',
    'links'     => true
 ) );

</source>

[edit] Parameters

Name	Default	Usage
before	'<div>Tags: '	Displayed before tags.
after	'</div>'	Displayed after tags.
separator	', '	Separator between tags.
links	true	True if show tag links instead false.

[edit] Return value

This tag displays content only, it does not have a return value. Typical output would be 'Tags: tag1, tag2, tag3'