'Filter by keyword' helps you discover content related to a specific term of interest.
By using a 'Filter by keyword' field (near top of overview pages), you can narrow down a list of articles related to a tag. Using this filter in effect provides a layered filtering: showing tagged content related to a specified keyword tag.
Specify in the 'Filter by keyword' field your term of interest (as you start typing, the field automatically tries to show you relevant tags) and then select 'Apply' to check for content tagged with your filter term.
As illustrated below, in some cases you may wish to combine filters. If you would like to find every 'feature article' mentioning 'dublin core', for example, then you could use activate both article type and keyword filters as in the example below.