Like ‘Categories’, ‘Tags’ help organize the posts on your site by providing searchable keywords and linking related posts. Tags are generally more specific than categories.
You can add a tag using the ‘Tags’ module in the post editor. Simply type the word you would like to use as a keyword and click ‘Add’.
You can add a group of tags to a post by separating them with commas. The ‘Choose from the most used tags’ link provides quick access to a list of popular tags on your site.
Depending on your theme and widgets, ‘Tags’ can display in both your posts and sidebars. Clicking a tag will take you to a list of tags containing that same keyword.