A string of characters, preceded by a hash symbol (#), used on a social media platform to categorize content. For instance, images of landscapes might be tagged with #landscapephotography, enabling users interested in that specific subject to find relevant posts easily.
Effective utilization significantly broadens the reach of posted content, connecting it with a wider audience beyond immediate followers. Historically, this feature emerged as a user-driven method of content organization, later formalized by social media platforms as a core functionality for discovery and engagement.