A hashtag is a type of metadata tag used on social networks such as Twitter, Instagram, Facebook, and other platforms to make it easier for users to find messages with a specific theme or content. It is created by placing the pound sign, or hash symbol (#), in front of a word or unspaced phrase. When used in this way, the word or phrase following the hash symbol becomes a searchable link within the platform. This allows users to click on the hashtagged word and access a feed of other posts that have been tagged with the same hashtag. Hashtags are widely used to categorize content, to participate in trending topics, to promote events or brands, and to connect like-minded individuals. They are a powerful tool in social media marketing as they can significantly increase the reach and visibility of a message or campaign. By strategically using relevant hashtags, marketers can engage with both their existing audience and potential customers who may be interested in the tagged topic.