In WordPress, a tag is a keyword contained in a link. Specific attributes are added in any link to come up with a tag. The tag that is created should be wrapped around; otherwise, you will only create a plain link not a tag.
Tags are recognized by search engines. Tags are also keywords because when a user visits your site and then types a certain word or phrase, the tag service can provide search results. Non-tags can also be included in the search results. More so, search result generations can contain every word that is stored in your post data.
What exactly are the purposes of tags? The purpose of tags can be summarized in three points. First, tags direct readers to the keyword-related content, whether it is on or off your site. Second, tags have the capacity to categorize group content of your site which is often based on keywords. Third, tags are identified by search engines because they are still treated as keywords.
However, you should be aware that tags are not necessarily helpful in improving your page ranking. Tags are not even capable of impressing the readers of your blog. You let yourself impress your readers not the other way around; however, this is another story. More so, tags should not be relied upon when it comes to social climbing and bookmarking.
Basically, tags are helpful in categorizing the contents of your site. But the categories still need to be set by the blogger himself. So you also have to manipulate the tag categories which means you have to be familiar with the tagging experience.
Your participation in WordPress blogging matters a lot when you make the most of the tagging process. In this case, you may consider employing some of the services offered by tag service crawlers.