Meme coins are cryptocurrencies created based on memes or jokes. They often have little practical value and high volatility but gain attention through internet culture. Popular examples include Dogecoin and Shiba Inu.

Key features of meme coins:  
1. Based on humor and hype rather than fundamental technology.  
2. High risk and potential for high returns.  
3. Dependence on community support and media buzz.  

Meme coins are often used for speculation but require caution due to their instability.