Meme Coins are cryptocurrencies based on viral internet memes, jokes, or trending topics. They are typically built on existing blockchains, primarily for entertainment, and lack practicality. Their value depends on community activity and the hype on social media, leading to significant price volatility, high speculation, and risk. Notable meme coins include Dogecoin and Shiba Inu, which have gained popularity in recent years, with a total market capitalization surpassing 100 billion dollars.