Searching for keywords and tags
When you search by keyword, you will find content and articles where your search text is found in the title or body of the post. A keyword search does not look into the tags that may have been added.
When you search by tag, you will find content and articles where the search text matches a tag that is used. Tags provide a way to categorize your content submissions and to group them with other content that have tags in common. A tag search does not look into the title or body of the post.
These types of searches apply only to content; they do not apply when searching for user profiles.