The Blockchain Trilemma is like the "you can only pick two" meme of the crypto world - it refers to the trade-offs that blockchain designers have to make between security, decentralization, and scalability. It's like a game of rock-paper-scissors where you can't have all three at once.
Example
"Bitcoin prioritizes security and decentralization at the expense of scalability, which is why transactions can be slow and expensive during times of high network congestion."
"Many newer blockchains are trying to solve the Blockchain Trilemma with fancy new consensus mechanisms and sharding techniques, but it remains an ongoing challenge."