A hashtag challenge is a social media trend where users create and share content based on a specific theme or activity, often using a designated hashtag. These challenges encourage participation and creativity, allowing users to showcase their skills or humor while connecting with others. Popular platforms for hashtag challenges include TikTok, Instagram, and Twitter. Typically, a hashtag challenge starts when an influencer or brand initiates it, inviting others to join in. Participants often film themselves performing a task, dance, or other activities, tagging their posts with the challenge's hashtag. This helps to build a sense of community and engagement around the challenge.