Reaction videos evolved from early YouTube 'react' channels and have become a cornerstone of digital culture across TikTok, Instagram, and Twitch. They typically feature a creator responding to another piece of content, capturing raw emotions ranging from pure joy to intense frustration. These memes often strip away the original video to focus solely on the exaggerated facial expressions or vocal outbursts of the reactor. From the 'Kids React' series to gaming streamers' frantic responses, the reaction format taps into the human desire for shared experience and validation, making it one of the most versatile and relatable meme formats on the internet today.