Expression Memes encompass a wide variety of internet tropes, ranging from character expression sheets used by artists to single-frame reaction faces that capture specific human emotions. These memes gained massive traction on platforms like Tumblr and Twitter through 'Expression Challenges,' where artists draw characters in numbered grids representing different moods. They serve as a universal visual language, allowing users to communicate complex feelings—from sheer joy to absolute existential dread—without saying a word. Today, they are a staple in social media communication, often used to react to news, personal anecdotes, or relatable daily struggles.