Simply put, a hashtag is an easy way for people to categorize, find and join conversations on a particular topic.The hashtag is used to highlight keywords or topics within a Tweet, and can be placed anywhere within a post.Thanks to the member-driven online information site Twitter, the lowly "pound" or "number" symbol "#" has been elevated to a new role. The hash mark, or pound symbol, (#) is now known by social media users as a "hashtag" or "hash tag". Posts that have the same keywords prefixed with the # symbol are grouped together in user searches, bringing a level of order to the frenzied chaotic world of Twitter.Hashtags.org is known as the defacto standard / resource for curating the world's list of hashtag definitions. Use our invaluable Hashtag Dictionary to search, understand, or define your tags of interest!